Tender For bid to ras bid to ras corrigendum : supply of cotton thread for plumber pack of 10 rolls 10gm or roll , gas r 134a 450gm per can , m seal 250gm pack , pin headed glass 3mm thick make finolex specs as per pdf documents , sleeve for copper pipe , ss single bowl with drainage board specs as per pdf documents , white cement 1 kg pack , wire mesh stainless steel specs as per pdf documents , pad locks 50mm 4 levers isi marked , cement base paint specs as per pdf documents , chemical for att 20 percent ec , ci brackets for whb , ci collar 150mm dia , clamp for ss curtain rods as per sample , coarse aggregate 12 point 5mm graded , cotton thread 10gm packing , dead plug or end cap of size 20mm , dome for ss curtain rod as per sample , fevicol 1 by 2 kg packing , flash cistern washer 15mm , flush cistern handle , flush cistern washer 20mm pack of 12 nos , flush strip make stp specs as per pdf documents , g i wire mesh having specs as per pdf documents , gi binding wires 0 point 90mm dia , glazed ceramic coloured specs as per pdf documents , glazed ceramic wall tiles specs as per pdf documents , grid for false ceiling specs as per pdf documents , kitchen plate rack stainless steel specs as per pdf documents , kitchen sink s stainless steel with specs as per pdf documents , lime for white wash , m s nails 75 mm long , machine screw brass specs as per pdf documents , magnetic catcher as per sample , ms nail 150mm long , ms nails 50mm , ms strip 25 mm x 6 mm , m seal 25 gm pack make pedilite , m seal 75 gm pack make pedilite , non skid coloured specs as per pdf documents , oil bound distemper specs as per pdf documents , oil putty specs as per pdf documents , old size flyash bricks , opc cement 43 grade in 50 kg bags , paint brush 100 mm wide , paint brush 150 mm wide , patchmate make hpcl or bpcl , pin headed specs as per pdf documents , round up chemical for grass remover and ) /bid number: gem/2026/b/7312163 * /dated: 10-03-2026 & & / bid document1 / 79 & & ' ' /item categorycleaning , rubber packing for fixing glass alm door , s stainless steel specs as per pdf documents , sand course , sand fine , screw wood 25 by 6 200 per pkt , screw wood 35 by 8 200 per pkt , spun yarn for pipes , ss curtain rod specs as per pdf documents , stainless steel peg set of six 450 x 38 x 3 mm in size. , star screw 25 by 6 200 per pkt , steel hexa blade of size 12 inch pack of 20 nos , steel window stay make isi marked , synthetic enamel specs as per pdf documents , thinner for synthetic enamel paint , white cement specs as per pdf documents , white cement specs as per pdf documents , cane plastic 4mm , cloth baze green 48 inch width , door seal 2 point 5 inch long make beeta , end caps for stainless steel curtain rod , fevicol make pidilite for mixing of distemper , figured glass of size specs as per pdf documents , foam cushion size of specs as per pdf documents , gland dori 14 mm , gland dori 6 mm , jumper or washer 20mm , kitchen plate rack specs as per pdf documents , kitchen sink austenitic specs as per pdf documents , lakh dana red , machine screw full thread 40mm long x 4mm thick , magic eye for door , malmal cloth , ms brackets for kitchen sink , ms brackets for whb , m seal 100 gm pack , nylon newar specs as per pdf documents , oil putty make shalimar or burger or jenson , paint synthetic enamel or oilegreen , plain head lost ms nails 100mm , plain head lost ms nails 25mm , plain head lost ms nails 40mm , plain head lost ms nails 63mm , road marking specs as per pdf documents , rubber sheet with insulation , safety chain for specs as per pdf documents , shellac best quality gde i , stainless steel curtain rod 1 point 2m long. , tapastry cloth superior quality 100mtr roll , tar plastic , thinner denture , touch wood wooden polishing , turpine oil , varnish gs make asian or shalimar , white cement 5 kgs specs as per pdf documents , wooden screw 15mm pkt of 100 nos , wooden screw 25mm pkt of 100 nos cotton thread for plumber pack of
Tender For bid to ras supply of furniture items - keyboard for 100 keys , mirror full size with frame , rack rifles for 10 rifles , safe regimental treasury chest , show case glazed , black board with fibre glass , chair barber adjustable with neck rest , mirror large size 1200x900mm with frame , counter keyboard for 100 keys, mirror full size with frame, dimension: (a) overall size shall be 1800x600mm. description: (b) the mirror shall be a full-size, clear glass mirror with a thickness of 5mm. (c) the frame shall be constructed of high-quality, polished, and finished hardwood, with a width of 50mm and a depth of 30mm. (d) the frame shall be joined using strong mortise and tenon joints to ensure durability and sturdiness. (e) the back of the frame shall be fitted with a protective plywood backing of 4mm thickness to support the mirror and prevent any shifting. (f) for secure hanging, the mirror shall be provided with heavy-duty, brass wall brackets (2 in number) for vertical mounting on the wall. (g) a protective covering shall be applied to the edges of the mirror to prevent breakage during handling and installation. (h) the mirror shall be encased in the frame in such a manner that the edges are completely sealed to avoid damage. (i) the entire unit shall be carefully crafted to ensure smooth, rounded corners for a safe and aesthetically pleasing appearance. (j) all joints and fixings shall be done as per standard specifications. rest all as per the drawing. finish: (k) the wooden frame shall be finished with a high-quality, clear lacquer coating to preserve the natural wood texture and provide a long- lasting, polished look. (l) all exposed wooden surfaces shall be free from any blemishes or imperfections. (m) a protective film shall be applied on the mirror surface during transportation to prevent scratches. rest all as per the drawing., rack rifles for 10 rifles, dimension: (a) overall ) /bid number : gem/2026/b/7348816 * /dated: 17-03-2026 & & / bid document 1 / 16
Tender For supply of led luminaire for road and street lights conforming to is 10322 (part 5/section 3) (v3) (under bis scheme - ii) (q2) , led luminaire for floodlight conforming to is 10322 (part 5/section 5) (v3) (under bis scheme - ii) (q2) , led luminaire (recessed luminaire) (ceiling light) conforming to is 10322 (part 5/section 2) (v4) (under bis scheme - ii) (q2) , led garden light (v2) (q2) , xlpe cable for working voltage up to and including 1.1 kv marked to is 7098 (part 1) (q2) , pvc insulated copper cable single core and multi core circular sheathed with flexible conductor (v2) isi marked to is 694 (q2) , moulded case circuit breakers (mccb) conforming to is/iec 60947 (part 2) (q3) , miniature circuit breakers (mcb) for ac operation marked to is/iec 60898 (part 1) (q2) , self ballasted led lamps (led bulb) (v3) conforming to is 16102 (part 2) (under bis scheme - ii) (q2) , led batten light (led tube light) (v2) (q2) , stainless steel wire mesh 1mm thick x 0 pt 56mm roll 35 kgs make best brand , kitchen rack stainless 3ftx2-1 by 2ft x9inch, 1mm thick make prayag, xen, prima, jaynam , scantling 1 st class wood size-75x75mm make best quality , aluminium mosquito proof wire mesh expanded type 4 ft x 50 ft roll make best quality , gi tubing 15 mm dia 6mt long make best quality , table top glass 1200mm x 600mm x 10mm thick plate tined glass with colour mak best quality , europian western commode ewc make parryware, prayag, hindware, jaquar , ply wood bwr 8ftx4ftx12mm make kitply, swastik, century, green ply, archid ply, sylvan , pvc flexible pipe 32mm dia 20 mtr roll make best quality , glass shelf 21 by 24inch make prayag, xen, prima, jaynam , helical door spring make best quality , stainless steel sink with draining board 1 mm thick 915mmx 460 mm make parryware, prayag, hindware, jaquar , orissa pan or make parryware, prayag, hindware, jaquar , top for table dining six person make best quality , pvc low level flushing cistern 10 ltr capacity make prayag, xen, prima, jaynam , glass panes 4 mm thick 3ftx4ft long make best quality , shelf adheshive tarfelt 10ftx10ft make best quality , corner glass shelf 300 mm with brass bracket make prayag, xen, prima, , jaynam , urinal pot vitreous china make parryware, prayag, hindware, jaquar , cp towel ring rectangular make prayag, xen, prima, , jaynam , pvc low level cistern make prayag, xen, prima, jaynam
Tender For supply of finolex or polycab or natural white or equivalent , led tube light fittings 20w rechargeble 230v box type 4 feets with crca body pre coated white and prewired for led tuble complete make havells or bajaj or philips or crompton , steel screw full thread with rawl plug 1.5 inch size isi marked 100 nos pkt , pvc switch board snow white size 7 inch x 4 inch for sockets and switches make havells or finolex or polycab or natural white or equivalent , pvc switch board snow white size 8 inch x 10 inch for main switches or db make havells or finolex or polycab or natural white or equivalent , pvc l bend and t junction joint for pvc casing and capping confirming to is 3419 part 3 make havells or finolex or polycab or natural white or equivalent , switch socket combination snow white multipurpose 2 in 1 15 amp 230 volts make havells or finolex or polycab or natural white or equivalent , switch socket combination snow white 5 amp 230 volts make havells or finolex or polycab or natural white or equivalent , service bracket 40mm dia gi tubing medium grade 1.5 mtr long make havells or finolex or polycab or natural white or equivalent , service cable pvc insulated aluminium conductor 1100 volt grade heavy duty served , ceiling rose three terminal snow white make anchor or ssk or cona , led bulk head fitting high pressure die cast aluminum front cover with glass cover with specially design gasket with led lamp 10 watts rechargeable make havells or bajaj or philips or crompton , pvc flexible wire copper conductor multi stranded , pvc flexible conduit pipe 15 mm dia make havells or finolex or polycab or natural white or equivalent , pvc round or squire block make havells or finolex or polycab or natural white or equivalent , fire extinguisher of one kilogram capacity dry power type conforming to is 13849 along with its accessories make cease fire or omex or alfa fire , earthing items earthing plate 600 x 600 x 6 mm galvanised steel suitable for gi strip fittings drilled with 2 nos holes for 6 mm dia near one side , ci earth pit cover of size 300 x 300 x 6 mm with angle iron of size 20x20mm 3 mm thick with ms frame , funnel fitted with 20 mm diameter gi pipe 1.5 m long pipe make jindal or tata or kalinga , gi wire 4 mm diameter for earthing , charcoal , salt normal , lightening conductor air termination single pointed aluminium rod 12 mm dia and 300 mm long , testing point terminal block make of gun metal and phosphorus bronze size 75 x 75 x 25 mm drilled and screwed including 3 nos 8 mm dia 25 mm long hexagonal head screw , aluminium strips 25 x 3.0 mm , galvanised iron strip 32 x 6 mm , earthing plate 600 x 600 x 6 mm galvanised steel suitable for gi strip fittings drilled with 2 nos holes for 6 mm dia near one side , insulating pvc block 75x75x30 mm with insulating clamp nut and bolt make presto or polycab or finolex , constr mtrl for earthing pit cement 43 grade opc packed in hdpe bag each 50 kg wt conform to is 8112 to 1989 make birla gold or ambuja or ultratech , furniture study chair of size length 56 cm height 82 cm and width 56 cm type lacquered finish with arm seat and back cushion velvet upholstery make supreme or equivalent , study table of size 4 feet x 2 feet wooden top on round tube structure with three drawers on one side , steel almirah of size 1855mm with 4 shelves ms sheet doors and and locker 1.00mm thick lock material brass and steel finished and thickness of shelves 0.90mm , mild steel rack adjustable sheet 1.00mm thick nuts and bolts are in hexagon blck steel overall height 1.755m depth 0.410m and width 0.915m , hand held trolley of size 1200 x 900 x 1200 //bid details 2 / 44 mm of 2 mm thick ms plateform and size of wheel 127 mm with loading capacity minimum 200 kg and overall weight of trolleys 19 kg
Tender For supply of body pre coated white and prewired for led tube complete make havells or bajaj or philips or crompton , screw full thread 6 x 19 mm isi marked 200 screw per pkt , pvc switch board snow white of size 7 inch x 4 inch for socket and switches make supreme or polycab or finolex , pvc switch board snow white of size 8 inch x 10 inch for main switch or db make supreme or polycab or finolex , pvc l bend and t junction joint for pvc casing and caping conformto is 3419 part iii make supreme or polycab or finolex , switch socket combination snow white multipurpose 2 in 1 15a 230v make anchor or ssk or cona , switch socket combination snow white 5a 230v make anchor or ssk or cona , service bracket 40mm dia gi tubing medium grade 1.5m long make jindal or tata or kalinga , service cable pvc insulated aluminium conductor 1100v grade heavy duty served with inner sheathing , ceiling rose three terminal snow white make anchor or ssk or cona , led bulk head fitting high pressure die cast aluminium front cover with glass cover with specially design gasket with led lamp 10 watts make bajaj or philips or crompton , pvc flexible wire copper conductor multi stranded 0.0016 oblique 76 make havells or finolex or plaza , pvc flexible conduit pipe 15mm dia make polycab or supreme or finolex , pvc round or square block make polycab or supreme or finolex , fire exitingusher of 1kg capacity dry powder type conform to is 13849 along with accessories make cease fire or omex or alfa fire , earthing items earthing plate 600x600x6mm galvanised steel suitable for gi strip fittings drilled with two nos holes for 6 mm dia near one side , ci earthing pit cover of size 300x300x6mm with angle iron of size 20x20x3mm thick with ms frame , funnel fitted with 20mm dia gi pipe 1.5m long make jindal or tata or kalinga , gi wire 4mm dia for earthing , charcoal , salt normal , lightening conductor air terminal single pointed aluminium rod 12mm dia and 300mm long , testing point terminal block make of gun metal and phosphorus bronzesize 75x75x25mm drilled and screwed including 3 nos 8mm dia 25mm long hexagonal head screw , aluminium strips 25x3mm , galvanised iron strip 32x6mm , earthing plate 600x600x6mm gi steel suitable for gi strip fittings drilled with two nos holes for 6 mm dia near one side , insulating pvc block 75x75x30mm with insulating clamp nut and bolt make presto or polycab or finolex , furniture study chair of size length 56 cm height 82 cm and width 56 cm lacquered finish with arm seat and back cushion , study table of size 900x600x750mm 18 mm thick prelaminated partecle board side pannel , steel almirah of size 1855mm with 4 shelves ms sheet doors and and locker 1.00mm thick lock material brass and steel finished and thickness of shelves 0.90mm of make godrej or stellar or tata , mild steel rack adjustable sheet 1.00mm thick nuts and bolts are in hexagon blck steel overall height 1.755m depth 0.410m and width 0.915m , hand held platform trolly with 500 to 600 kg load carrying capacity height 140 to 150cm length 140 to 150cm width 90 to 100cm material ms //bid details 2 / 41
Tender For supply of superstructure of large store shelter lss of size 18 point 30 m x 6 point 10 m x 4 point 75 m height with 1 point 50 m verandah , cement opc 43 grade packed in hdpe bag each 50 kg wt , coarse sand free from vegetation , coarse aggregate 20mm graded , coarse aggregate 40mm graded , coarse aggregate 40 to 63mm graded , rr stone masonry , water proofing compound , mild steel bars of size 6 to 8mm dia , mild steel bars of size 10mm dia , glass dividing strips 30 x 4mm , ms binding wire , distribution box 8 way spn comma 240 volts copper bus bar and neutral link earthing stud double door type , mcb spn 240 volts 32 amps , mcb sp 6 to 32 amps , pvc tape 19mm wide 5 m long , cable pvc insulated electric cables heavy duty copper conductor of size 1 point 5 sqmm single core , cable pvc insulated electric cables heavy duty copper conductor of size 2 point 5 sqmm single core , pvc casing capping of size 1 inch medium grade , pvc casing capping of size 3 oblique 4 inch medium grade snow white , switch piano 5 amp 230 volts flush type one way snow white , led tube light fittings 20w rechargeble 230v box type 4 feets led tuble complete , steel screw full thread with rawl plug 1 1 oblique 2 inch size 100 nos per pkt , pvc switch board snow white size 7 inch x 4inch for sockets and switches , pvc switch board snow white size 8 inch x 10 inch for main switches db , pvc l bend and t junction joint for pvc casing and capping , switch socket combination snow white multipurpose 2 in 1 comma 15 amp 230 volts , switch socket combination snow white 5 amp 230 volts , service bracket 40mm dia gi tubing medium grade 1 point 5 mtr long , service cable pvc insulated aluminium conductorheavy duty 10 sqmm 2 core , ceiling rose three terminal snow white , led bulk head fitting hwith led lamp 10 watts rechargeable , pvc flexible wire copper conductor multi stranded 0 point 0016 oblique 76 , pvc flexible conduit pipe 15 mm dia , pvc round or square block , fire extinguisher of 1 kg capacity comma dry power type along with its accessories , earthing plate 600 x 600 x 6 mm galvanised steel suitable for gi strip fittings , ci earth pit cover of size 300 x 300 x 6 mm with angle iron of size 20x20mm , funnel fitted with 20 mm diameter gi pipe 1 point 5 m long pipe , gi wire 4 mm diameter for earthing , charcoal , salt normal , air termination single pointed aluminium rod 12 mm dia and 300 mm long , testing point terminal block make of gun metal and phosphorus bronze size 75 x 75 x 25 mm drilled , aluminium strips 25 x 3 point 0 mm , galvanised iron strip 32 x 6 mm , insulating pvc block 75x75x30 mm with insulating clamp nut and bolt , study chair of size length 56 cm comma height 82 cm and width 56 cm , study table of size 4 feet x 2 feet wooden top on round tube structure with three drawers on one side , steel almirah of size 1855mm with 4 shelves ms sheet doors and and locker 1 point 00mm thick , mild steel rack adjustable comma sheet 1 point 00mm thick comma overall height 1 point 755m , hand held trolley of size 1200 x 900 x 1200 mm of 2 mm thick ms plateform and size of wheel 127 mm
Tender For supply of hub oil seal per each , hub lock nut per each , steering rack per each , steering mager kit per each , steering toy raad per each , steering end ball joint per each , steering box per each , nackal kit per each , king pin bush per each , king pin bearing per each , air tank and chikni per each , urea injector per each , speed sensor per each , babal wheel , wheel aligntment , wheel balancing per each , ball valv per each , ac gas per filling , ac compresorr per each , ac coling coil per each , ac pipe per each , tail lamp per each , head light per each , head light cutout per each , helogen blub per each , fog light per each , bulb 1141 1167 53 per each , cluster miter per each , amplifire 12v 24v with fitting per each , gps system with fitting per each , reverse farward switch per each , temperature senser unit per each , head light combination switch per each , wiper moter per each , wiper link per each , wiper bilet per each , washer tank with moter per each , coolent tank per each , solenoid switch per each , starter bendex per each , starter armiture per each , starter bush per each , starter burash per each , starter coil per each , altinator bearing per each , altinator roter per each , altinetor rectifive pilet per each , altinetor cutout per each , altinator belt per each , altinator stetor coil per each , new complete wiring , temperature tee sensor per each , horn per each , emergency syron 12v 24v per each , emergency lamp 12v 24v per each , fule pump per each , cover pataa per each , main pataa per each , pataa 1.2.3.4.5.6 number per each , pataa u clip per each , pataa khobla per each , pataa pin per each , pataa bushing oer each , pata repairing , center bolt per each , suspention kit rh lh per each , front . rear complite stard shokupser per each , k p c frame pin bush per each , front lower arm per each , radiator cleaning , new radiator per each , front wind screen glass per each , door lock per each , door mirror per each , body fondation per each , tractor hood , seat cover , seat repering , trali hinch per each , body patra 18g per sq ft , body ms sheet per sq ft , hydrolic oil seal per each , hydrolic pump complete per each , hydrolic rubber pipe per fit 12inch , hydrolic raad per each , hydrolic bush per each , hydrolic tube per each , p.t.o gear box kit per each , new vaccum pump per each , bangdi pipe per meter , boss pump all parts with fiting , water tank tractor , loder bukit , bukit plate per sq ft , bukit cutter dental per each , fawarni pump kit , bvc dipper section per each , battry wire per fit , water body fan , axcel assembly , sensor , all engine repair , half engine repair , oil and filter changing , all gear box repair , cluch plate and pressure plate opening and fiting , all break repair , wheel cylender fiting , hydrolic cylender fiting , master cylender fiting , pto gear opning fiting , all hub gracsing , wiring repairing , starter servicing , altinator servicing , wiper motor servicing , cylencer mufler , ac servicing , light cheking and fiting , complete body color , body door fiting adjesting , new cylencer , cylencer repairing per inch , cylencer caithelic convertor , front . rear door glass lock repair , //bid details 2 / 107 body fondation new fiting , water servicing , full suspention repair , body finishing , o ring kit per each , trali patra welding per fit , vaccum pump fiting , fawarni pump repair , dash board opening and fiting , new bumpher , bumpher repairng , diagnosiste charges
Tender For supply of furniture and kitchen equipment 03 nos emrs d d - dual desk class 6 8 , dual desk class 9 12 , principal table , vice principal table , office table , teachers table , meeting table , library table , computer work station , one side book shelf , steel glass door almirah , steel almirah , 5 seater sofa , 4 seater sofa , metal bed , metal table with integrated storage , 8 seater ss top fixed canteen table , 6 seater ss top fixed canteen table , lab stool , high back chair , medium back chair , visitor chair , chair without arm , personal locker unit , magnetic white board , melamine surface non magnetic chalk board , tea table , physics table , ss one burner stock pot range , ss 2 burner indian cooking range. , ss single sink unit. , ss tilting type bulk cooker , ss tilting type boiling pan. , ss spice trolly . , ss work table with 1 bottom shelf. , chapati hot plate . , semi automatic chapati making machine . , conveyor type toaster . , ss 4 door vertical chiller. , deep freezer. , dry masala grinder . , pulveriser . , dough kneader. , ss 6 vessel hot bain marie with 1per1 gastro norm pan with front tray rail. , platfrom trolly . , kitchen utility trolly . , ss pot rack 4 shelf . , ss storage rack 4 shelf . , hdpe pallet of capacity 2200 to 2500 kg. , potato piller . , ss hood with ss filter , gi ducting for hot air suction . , fan for hot air suction . , 10 cylinder 5 x 2 10 lpg gas. , 1per 2 inchi dia lpg pipe line
Tender For supply of single pole isi marked type piano no of way type bell push volts 250 v amp 16 a , pvc copper conductor standard single core 1 point 5 sqmm , alumn mechanical cable lugs 120 sqmm duly isi marked , moulded case circuit breaker mccb ac 415 v breaking capacity 10 ka nos of pole four current rating 63 amp thermal magnetic release type duly isi marked , alumn mechanical cable lugs 95 sqmm duly isi marked , miniature cicuit breaker mcb series c curve operating voltage 240 v 415 v ac 60 v dc per pole circuit breaking cap 10 ka three pole tp rating 63 amps duly isi marked , cp wall mixer telephonic with l band , 20 mm brass float valves comptete with rod , cp 15 mm wall mounting combination fancy taps assembly single hole , cp 15 mm pillar fancy taps mounting combination assembly single hole , cp 15 mm centre hole basin , cabinet mirror size 350 into 450 mm , stainless steel plate rack of 5 shelf with fitting items 31 into 36 into 10 , cp 15 mm sink cock one hole basin mixture with swivel spout , cp 15 mm fancy bib taps , cp 15 mm fancy type shower , pvc 20 mm float valve comptete with rod , bathroom looking mirror 450 into 600 into 3 mm with plastic frame , stainless steel kitchen sink single bowl with drain board 37 into 18 into 8 , brass 15 mm stop vales internal thread , door closer hydraulic , kitchen sink stainless steel, size 24 into 18 into 8 , brass 15 mm stop vales external thread , glass corner shelf 12 , pvc flushing kit complete set for low level flushing cistern 10 ltr , pvc 15 mm float valve complete with rod , cp waste coupling for kitchen sink 38 40 mm lower and upper size 100 mm , cp health faucet with 1 point 5 mtr tube hook , cp waste coupling for kitchen sink 38 40 mm , pvc 15 mm pillar cock , pvc 15 mm bib tap long body with flange , cp curtain rods 20 mm dia and 12 ft length each best quality , ewc wall hung type with flushing cistern ceramic , led looking mirror 450 x 600 mm , counter top wash hand basin , cp centre hole basin mixture , glass corner 300 into 300 mm with ss grill , cp towel rack ss dual type 304 grade , gi pipe 15 mm , gi pipe 20 mm , cp 15 mm two way type angle cock , water tank cylinderical cover 500 1000 ltr , pvc seat and back of chair varandah 4 mm thick , pvc seat for chair dining 4 mm thick , 100 mm thick plyurethane flexible foam 90 open cell minimum density 40 kgs per , pad lock 65 mm , synthetic enamel paint 4 ltrs container smoke grey , cloth malmal , knob for drawer 30 mm dia , hydraulic system in best quality of chair revolving computer