Latest portering service Tenders | Government portering service Tenders

CTN :43126147

23 Dec, 2025 NA

Bangalore - Karnataka

Tender For corrigendum : supply of general tools c c > f> f-- electronic component soldering machine 25 30 w , manual wrench set 20 pieces , watch maker tool set , 20 pieces screw driver set , pipe tool wrench medium duty manual operated , stripper for electric wires , electric cable cutter steel , hot gun for glue stick , tool for lan end connector and wire crimping , high carbon heavy duty cutting plier , drift set 12 pcs pin chisel , snap punch set 1mm to 10 mm , tabletop drill machine , portable engraving machine , screw driver set combination 8 in 1 , portable torch with high intensity led , traffic light stick rechargeable , safety jacket for technicians , combination set of spanner 6-22 mm , polyester sling 4-meter webbing with 4-ton capacity , shackle d type capacity 4. 75 ton , u grip bull dog with locking mechanism , headband strap with led , bct 700 battery testing device , 30 pieces metal, wood and stone drill bit , high intensity led 20 w flood , sq 1. 5 mm wire copper , c32 mini mcb , portable 10 w lamp 10 m cord ) /bid number: gem/2025/b/6982677 * /dated: 10-12-2025 & & / bid document1 / 24

Central Government/Public Sector

CTN :43258926

08 Jan, 2026 5.74 Lacs

Udyogamandal - Kerala

Tender For supply of consumables for maintenance - spider for lovejoy coupling l 095, spider for lovejoy coupling l 100, spare spider for coupling size 110, spider for lovejoy coupling l 150, coupling lovejoy flexible l 095, coupling lovejoy flexible l 100, coupling lovejoy flexible. l150/f0150, fenner make, c i. coupling with pilot bore and spider, nitrile rubber for coupling lovejoy flex. l0225/ f0225, sheet pvc transparent flexible-3mm thick flexible, transparent pvc sheet of size approx. 1.2metres, width) x 1.5metres-10metres (length) x 3mm, thickness), diaphragm rubber sheet, 6 mm thick, hardness : 50, +/- 5 deg. neoprene rubber sheet, approx. length 2, m, width : 1 m, black colour, plain, for flange packing,, vulcanized, diaphragm rubber sheet 8 mm thick diaphragm, rubber sheet 8 mm thick, hardness 50+/-5 neoprene, rubber sheet approximate length 10 m, width 1m,, black colour, plain for flange packing, vulcanized of, size 10 m x 1 m x 8 mm sheet will be approximate, 125 kg, compressed asbestos fibre jointing sheet , compressed asbestos fibre jointing sheet, nonmetallic for gasket 3 mm thick make:, champion/spitmaan/ amj, compressed asbestos fibre jointing sheet , compressed asbestos fibre jointing sheet, nonmetallic for gasket 1 mm thick make: champion/, spitman/ amj, welding hand gloves, leather type. size- 14" long with, en/isi approval., steel wire brush - ss wire scratch brush with curved, wooden handle 5 row, hose clamp 19 mm ss grade 304, size: 19 mm, hose clamp 25 mm ss grade 304, size: 25 mm, hose clamp 32 mm ss grade 304, size: 32mm, nylon rod 50 mm dia x 300 mm long, nylon rod 80mm x 300 mm long, cutting wheel for angle grind m/c 100x2x16mm, grinding wheel -size: 4 " suitable for fixing in angle, grinding machine. good quality without any defects., make: bosch /cumi/makita., blade hacksaw hss 6 tpi 400 x 32x 1.6 mm., (miranda/bipico) -material :carbon steel, miranda/ bipico or equivalent, rust preventive /wd-40,420 ml container, with spraying arrangement/aerosol, spary, high temperature grease skf lghp 2/5 or, equivalent, hot air gun with 9 mm reducing nozzle, 2000wmake:, bosch/hitachi/stanley/dewalt, blade jigsaw-t101d-for wood cutting make:, bosch/dewalt/makita/hitachi/hikoki/, bullet, blade jigsaw-t144d -for wood cutting, make:bosch/dewalt/makita/hitachi/hik, oki/bullet, ptfe teflon tape size 3/4" width x10 meter, length - ptfe teflon tape size 3/4" width, x10 meter length champion make, thinner 6756 (for epoxy paint), welding machine - arc 225a, ac 230v, single, phase. make:sai/esab/ador, angle grinder- disc dia 100 mm make, bosh/black & decker/dewalt/hitachi/, stanley, caliper vernier 300mm, rod pvc - 80mm od - in lengths of 1000mm, rod pvc - 90mm od, rod ptfe 80mmx1000mm, teflon tape 12mm in 12 mtr length, jig saw machine suitable for cutting plywoods,, wooden boards. power capacity : 700 w minimum,, maximum weight 2.5 kg with variable speed dial,, cutting depth in wood minimum 75mm make:, bosch /dewalt/hitachi. warranty : 6 months., marble tile cutter suitable to cut off wheel, 110mm dia, for tile cutting work, 1050w capacity,, 12000 rpm speed, includes 110mm dia cut off wheel, 1 no.warranty : 6 months, make: bosch / cumi /, makita / dewalt / kpt / hitachi, cutting wheel for angle 125x1.0x22.23 mm, blade power hacksaw hss 10 tpi, 400x32x1.6mm - make: miranda, bipico or, equivalent, outside micrometer - 0.01 mm.100-125 mm, micrometer set-inside - range:50 - 200 mm,

CTN :43188173

31 Dec, 2025 13.36 Lacs

Multi City - Karnataka

Tender For supply of martials new gp building shettahalli grampanchayt under mgnrega scheme - electrification items sthl gp, electrification items sthl gp, mathi/nandi wood planks for panels 25 mm thick sthl gp, bib cock 20mm nominal bore sthl gp, transportation loading and unloading at1percent on material sthl gp, tools and plants at2percent on material sthl gp, hom of cutting and grinding machine1 sthl gp, hom of welding and grinding machine sthl gp, mechanic class ii/mechanic hmp grade i/eme grade sthl gp, anticorrosive bitumastic paint sthl gp, ms square rod 12x12 sthl gp, ms square rod 20 mm x20mm vertical sthl gp, dia 50 mm ms hollow pipe b class 14 gauge sthl gp, polythylene pipes high density 25mm external dia sthl gp, polythylene pipes high density 32mm external dia sthl gp, add 5percent for fittings and wastage charges sthl gp, add cement sand and grit 1percent on material sthl gp, handling loading and unloading 3percent on material sthl gp, labour charges for lifting and placing in position and making connection at 7percent on material sthl gp, polyenthylene water storage tank of specified capacity l sthl gp, add white lead paint, gasket, cement, sand for making good the wall and floor at 2percent on material sthl gp, licenced plumber with tools sthl gp, lead or pvc connection pipe 32mm dia (for wash basin) sthl gp, c.i. / m.s. brackets for flushing cistern sthl gp, brass stop cock sthl gp, cp brass waste 32 mm of standard pattern sthl gp, cp brass chain with plug sthl gp, copper plated brass piller tap 15mm sthl gp, white vitreous china clay flat back wash basin size 630x450mm sthl gp, pvc pipe of 4kg cum 110 mm sthl gp, add brush, putty, sand paper, roller at 5percent on cost of paint sthl gp, plastic emulsion paint sthl gp, lime sthl gp, add brush, putty, sand paper at 2percent on cost of paint sthl gp, water proofing cement paint sthl gp, white cement sthl gp, ceramic tiles of size 30 x 30 cms sthl gp, vitrified tiles 600x600 mm sthl gp, binding wire sthl gp, tmt bars fe 500 sthl gp, add brush at 1percent on cost of paint sthl gp, enamel metal paint sthl gp, add providing and removing scaffolding at 3percent on labour sthl gp, painter class i sthl gp, add wire brush, fine steel wool, putty, sand paper, at 3percent on cost of paint sthl gp, ready mix primer paint (ready mix red lead paint) sthl gp, add hom of welding and grinding machine at 4percent on material sthl gp, welder grade i sthl gp, fitter class i sthl gp, ms flat sthl gp, m.s rods sthl gp, add hom of welding and grinding machine at 2percent on material sthl gp, fabricator sthl gp, add 15percent wastage for glass sthl gp, plain glass 5.50 mm thick sthl gp, chrominum plated screws sthl gp, cleat angles sthl gp, alluminium handles - 15 mm sthl gp, alluminium tower bolt - 20 cm sthl gp, pvc beading sthl gp, rubber beading for shutters beading sthl gp, nylon rollers sthl gp, aluminium window frame section 1.20 mm thick sthl gp, hom of machinaries for planing sthl gp, add cutting and other wastage 5percent sthl gp, honnewood planks for panels 20 mm thick sthl gp, honne wood sthl gp, add handling , loading and unloading at 1percent on material sthl gp, burnt bricks class 35 (non modular) sthl gp, add watering charges at 1 percent on labour sthl gp, stone chistler class ii sthl gp, mason class i (with tools) sthl gp, mixer (concrete small used in culvert) sthl gp, boulders sthl gp, bond stone 20 x 20 x 45 cm sthl gp, size stone 20 x 20 x 25 cms sthl gp, hom of vibrator 0.71 days sthl gp, plasticizer / super plasticizer sthl gp, casurina poles 100 - 150 mm sthl gp, add handling , loading and unloading at 2percent on material sthl gp, casurina poles 75 - 100 mm dia sthl gp, jungle wood runners and planks sthl gp, silver oak or equivalent planks 38 mm thick sthl gp, mason class ii (with tools) sthl gp, add watering charges at 1 percent on material sthl gp, mixer (concrete) - 1 cum capacity sthl gp, portland cement sthl gp, coarse sand (zone iii) sthl gp, broken stone aggre

State Government

CTN :43228970

01 Jan, 2026 58.1 Thousand

Raipur - Chhattisgarh

Tender For estimate for replacement of bend lt pole at shitla talab daldal seoni raipur under daldal seoni zone of city dn. (east) raipur. 78-33p-5145-25-0046 dt. 03.12.25. r4533p250660. (33p-152-i)estimate for repairing of damage 11 kv ab cable section near amaseoni flyover bridge raipur under kachna of city dn. (east) raipur. 78-33p-5145-25-0047 dt. 03.12.25. r4533p250729. (33p-153-i)estimate for repairing of damage 11 kv ab cable section near agrawal public school raipur under kachna zone of city dn. (east) raipur of city dn. (east) raipur. 78-33p-5145-25-0048 dt. 03.12.25. r4533p250763. (33p-153-i)estimate for tree cutting & restringing of 11 kv ab cable near "behind wood estate" raipur under kachna zone of city dn. (east) raipur. 78-33p-5145-25-0043 dt. 01.12.25. r4533p250618. (33p-151-i)

State Government

CTN :43238979

08 Jan, 2026 40.00 Lacs

Bathinda - Punjab

Tender For supply of supply and installation of equipment and consumable for idea lab d d -single nozzle 3d printer , pcb milling machine , co2 laser cutting machine , vinyl printer , 3d scanner , lathe machine cum milling , belt and disc sanding machines , scroll saw , wood turning lathe , bench top drill machine , portable welding machine , computerized sewing machine , filament dehydrator , reflow oven , digital multimeter , mso 200 mhz , digital oscilloscope , power supply , function generator , bench top multimeter , non-contact voltage tester , lcr meter , soldering station , digital microscope , soldering rework station , hand drill machine , cordless drill , jig saw , miter saw , hot air gun , table saw , bench grinder , angle grinder , straight grinder , circular saw , blower , cordless screw driver , vaccum cleaner , random orbit sander , planer , cordless vaccum cleaner with kit , rotary tool kit , rubber grip hacksaw , hacksaw mini , claw hammer steel shaft , ball pein hammer , rubber mallet , ring spanner set 12 pcs , open end spanner set 12pcs , combination spanner set 8 pcs , allen key set 10pcs , allen key set 12pcs , combination plier , long nose plier , circlip straight 5 inch , circlip bent , diagonal cutter , wire stripper , adjustable spanner , pipe wrench , c clamp , c-clamp , snap- off knife , 16pcs screw driver set , 6pcs precision screw driver set , max steel snip cutter , pvc pipe cutter , hot glue gun , small file set , big file set , chisel set , punch set , bench vices , router bit starter kit , drill bit set , baby vice , ratchet set , pegboard , digital vernier caliper , micrometer , steel rule 300mm , steel rule 600mm , engineering square , meter tape 30m , measuring tape 3m , measuring tape 5m , spirit level , goggle , apron , ear muff , mask , fire extinguisher , first aid kit , gloves pair , 3d printer filament , acrylic sheet , foam sheet 8mm, 4ft x 4ft , ply board 5mm, 2ft x 4ft , nylon rod 12mm 15mm 18mm 25mm of length 1m , nuts, 3mm 4mm 5mm 6mm ) /bid number: gem/2025/b/7013688 * /dated: 18-12-2025 & & / bid document1 / 110 & & ' ' /item category8mm 10mm 12mm, pack of 100 , bolts , screws , washers , studs , nails , adhesive 1kg , 2 way tape , pvc pipe . 75 inch,10ft , pvc pipe 1 inch10ft , pvc pipe 1. 5inch 10ft , pvc pipe 2. 0inch 2. 5 inch, 3inch length 10ft , aluminium channels , l c box strip length 12ft , pcb drill bit 0. 4mm , pcb drill bit 0. 8mm , pcb drill bit 1mm , drill bit 4mm , drill bit 5mm , drill bit 6mm 8mm, 10mm, 12mm , arduino uno r3 , arduino nano , arduino mega , raspberry pi model 4b, 4gb , esp8266 nodemcu , esp32 development board , beaglebone blu , beaglebone black , voltage regulator module , mini micro submersible water pump , piezoelectric plate , 8x8 led matrix module , bluetooth , 7 inch segment led display , gsm or gprs or gps module , laser module , ldr module , 4x4 matrix keypad , joy stick module , active buzzer big , active buzzer small , motor driver , sound playback module , bo motors , vibrating motor , capacitive touch switch , ir sensors obstacle sensors , triple axis magnetometer , humidity sensor , mq-2 , mq-3 , mq-4 , mq-5 , mq-7 , ultrasonic sensor module , triple axis accelerometer , pir motion detector module , pulse rate heart sensor , relay module , soil moisture sensor , touch sensor , rain drop sensor , flex sensor , temperature sensor , force pressure sensor , colour recognition sensor , water flow sensor , sound sensor , ir sensor array for line following , rfid reader-tags , rf modules txand rx 315 mhz ask , stepper motor with driver board , servo motor 360 rotation , servo motor 180 rotation , metal gear servo motor, 180 rotation , solder wire 100grm , solder flux , 830 points solderless breadboard , 400 points solderless breadboard , copper clad board single side , copper clad board double side , male to male breadboard jumper , female to female breadboard jumper , male to female breadboard jumper , usb cables , radium cutter kni

CTN :43252098

24 Dec, 2025 NA

Visakhapatnam - Andhra Pradesh

Tender For disposal of scrap iron scrap at vd vsp , ss cans/ss items scrap at vd vsp , aluminum cans /aluminum items scrap at vd vsp , broken/damaged ghee tins scrap at vd vsp , once used glass bottles and broken glass pieces scrap at vd vsp , broken plastic crates scrap at vd vsp (only for authorized recyclers) , broken plastic items (buckets, milk cans, chairs wheels, carboys )and others scrap at vd vsp (only for authorized recyclers) , shrink film polythene scrap (only for authorized recyclers) , polythene liners scrap (smp) at vd vsp (only for authorized recyclers) , un-used polythine covers (sfm) scrap at vd vsp(only for authorized recyclers) , wet conditioned film (milk, butter milk, lassi, curd cups, elp film and alluminum foils & etc.) scrap at vd vsp (only for authorized recyclers) , 25 lts. capacity once used empty cylindrical plastic carboys at vd vsp , 30 lts. capacity once used empty plastic carboys at vd vsp , 50 lts. capacity once used empty plastic carboys at vd vsp , 100 lts. capacity once used empty plastic carboys at vd vsp , film cores scrap at vd vsp , once used corrugated boxes scrap at vd vsp , once used empty kraft paper bags at vd vsp , maida flour empty hdpe bags vd-vsp , sugar/packing empty hdpe once used bags at vd vsp , crystal salt empty hdpe bags at vd vsp , damaged/un-used tyres & tubes scrap at vd-vsp , broken furniture (teak wood) & wooden scrap at vd vsp , waste oil at vd vsp (only for authorized recyclers) , e waste (electricals & electronics wastage) (only for authorized recyclers) , electrical motors scrap at vd vsp , paper cutting waste and waste papers , 20 ltrs capacity chaco dips re-used empty buckets , once used empty jute gunny bags at fmp-anakapalli , once used empty jute gunny bags at fmp-amadalavalasa , once used empty h.d.p.e bags at (fmp-anakapalli)

CTN :42886339

22 Dec, 2025 NA

Jabalpur - Madhya Pradesh

Tender For bid to ras supply of tail light glass , rear break shoe , head light assy. , air filter , break light bulb , parking bulb , front disk pad , self clutch baring , silencer , fuel pump assembly , clutch plate with housing , spark plug , injector , oxygen sensor , chain sprocket , clutch cover and magnet cover packing , kil switch on off , chain socket , speedo meter cable , clutch plate , kick return spring , front break wire , front tyre with tube , rear tyre with tube , tail light cover assy. , front disk rotter , speedometer gear , indicator front and rear , horn 12v , clutch lever hunter , main stand hunter , brake lever hunter , air filter hunter , oil filter hunter , head light bulb , eng. chassis mount. bolt , clutch lever yoke , breaker lever yoke , acc. cable , ignitions switch key , front wheel axle nut , carburetor boot , air intake tube , brake shoe front , brake shoe rear , side mirror set , speedo meter cable , speedo meter gear , rear wheel rubber cushion , rear wheel brk. fld. container , front tyre with tube , accl. cable , indicator set , clutch cable , clutch lever , horn 12v , tappet cover gaskit kit , spark plug cap , ht lead , kick returner spring , fuel pump , fuel pump filter , oil filter , neutral switch , hub nut rear , self carbon bush with plate , rear drum rubber , fan belt , front wheel bearing , wheel cylinder rear , front disc pad , clutch slave cyl. , clutch master cyl. , belt tensioner , belt idler , trimming belt , alternator cut out , oil seal , alternator slip ring , c. e. bearing alternator , d. e. bearing alternator , self bendex pinion , self carbon brush plate , self starter shaft , air filter element , alternator pulley , brass plate for commandant , tata 1512 clutch cleave cylinder , diesel filter plate , solonoid switch fip 24v , banzoo washer 17no , banzoo washer 19 no , clutch plate pressure plate release bearing 60 gb , clutch master cylinder , wheel bearing tata 1613 , fuel filter primary , fuel filter with water separator , u. j. cross , water separator , fuel filter , front indicator assy. lh. rh. set , wiper blade all type 08 set , air dryer , air cleaner hose pipe , spark plug mpfi , self bendex pinion , wiper blade set , self starter bendex pinion , self solenoid switch , u. j cross , carbon brush plate , wheel bearing rear inner , wheel bearing rear outer , wheel bearing front inner , wheel bearingfront outer , lock patti front , lock patti rear , front disc brake pad , bonnet opening cable , tail light assy. lh. rh set , head light assy. lh. rh set , wiper motor linkage , front indicator assy. set , fuel filter with water separator , front disk pad set , rexine black , fome sheet 65mm 72inchx35inch 6x3 , bostick compound 01 ltr , cutting blade 4inch bosch , ply wood 12mm 6x4 , hexa blade , hand grinder machine 800v , drill bit 4mm to 12mm set , tool box kit complete set , welding glass , pop rivit pkt , special gray paint 01 ltr , thinner 01 ltr , putty kg , body solder kg , anabond tube 85 gram , welding rod 10 no , welding rod 08 no , m. seal

CTN :43050804

20 Dec, 2025 40.00 Lacs

Aliganj - Uttar Pradesh

Tender For bid to ras providing of design installation and maintenance of educational lab/centre - vocational lab; supply and installation of hardware; buyer - name of the tool/equipment, plane table instrument kit, bradawl, electrician connector screw driver, insulated thin handle, electrician screw driver insulated thin handle, firmer chisel wood, firmer chisel wood, gimlet, hammer ball peen with handle, hammer cross peen with handle, heavy duty screw driver, neon tester, pincer, plier insulated, plier side cutting, punch center, screw driver, screw driver, scriber(knurled centre position), steel rule, steel tape, tennon saw, wirestripper, knife double bladed, tweezers, combination plier insulared, screw driver insulated, file square, file square, file traingular, flat file bastured, flat file second cut, flat file 2nd cut smooth, hacksaw fram fixed, electriacian knife, hammer, wire cutter, file flat rough, bending spring external type for copper, tube, box spanner, cappilary plug gauge, flaring tool set single type for tube, mechanical tube/pipe bender, ring spanner off set, ring spanner off set, spanner double ended, spanner double ended, swaging tool punch type set of size for tube, swaging tool screw type set of size for tube, valve key t handle, wrench adjustable, wrench adjustable, wrench adjustable, garment hanger, leg shaper, pattern notcher, pattern punch, scissor, tailor square, waste bin, buckets, piercing plier & piercing valve both with, acess fitting, pinch off plier/crimping plier tool, socket set ratchetreversible 12.7 mm, square drive with extension, torque wrench square drive right and left hand, pedestal grinder double end type, hydraulic power saw machine suitable, side draught dry paint booth overall dimention in mm, vacuum cleaner, vacuum cleaner, multi drawer tool rack trolly capacity

CTN :43219838

29 Dec, 2025 NA

Lohit - Arunachal Pradesh

Tender For supply of pkt , wooden beading 2 inch x zero pt 5 inch x 12 feet class a hard wood without knot and crack , wooden filler , wooden scantling 3 inch x 2 inch x 12 feet class a hard wood without knot and crack , wooden scantling 3 inch x 3 inch x 12 feet class a hard wood without knot and crack , woodtech pu interior glossy clear , woodtech pu sealer best for wooden interiors , woodtech pu thinner , bib cock plastic 15 mm with isi mark , bib cock steel 15mm with isi mark , cistern for western type with isi mark , connection pipe for gyser , cp jet spray health fauset 15 mm dia with isi mark , cp waste coupling for wash basin 32 mm dia with isi mark , gi bend 1inch , gi elbow 15mm , gi elbow 1inch , gi gate valve 25 mm , gi gate valve15 mm , gi nipple 15mm x 2 inch long , gi nipple 15mm x 4 inch long , gi nipple 25mm x 2 inch long , gi nipple 25mm x 4 inchlong , gi pipe 15 mm 6 mtr , gi pipe 25 mm 6 mtr , gi socket 15mm , gi socket 25 mm , gi tee 15 mm , gi union 15 mm , gi union 25 mm , hexa blade 12 inch , m seal 100g pkt , standard polypropylene commode seat cover toilet seat cover standard size white , teflon tap half inch x 10 mtr , wastage jali 4 inch material stainless steel , waste pipe for kitchen sink , waste pipe for urinal , wc european type with cistern complete set with isi mark , 32pcs heavy half inch combinational ratchet socket wrench spannar tool goti set with carry box with isi mark , 50 watt led flood light , aliminium service wire 4 sqmm with isi mark 100m roll , aluminium wire 2 core service cable 10 sqmm with isi mark 100 m roll with isi mark , ceiling fan 1200mm with isi mark , cutting plier oblique combination plier 210 mm with isi mark , exhust fan 300 mm with isi mark , fan capacitor with isi mark , fan regulator with isi mark , flood light 100w with isi mark , fuse kit kat 63 amp with isi mark , heavy duty drill machine 600 w with isi mark , hss taper shank twist drills short series as per is 5103 drill bit 4 mm , hss taper shank twist drills short series as per is 5103 drill bit 6 mm , insulation tap 25 m , led bulb 12 watt with isi mark , led bulb 18 watt with isi mark , led tube light complete set 20 watt with isi mark , line tester 15 amp shock proof heavy quality with isi mark , mcb 63 amp 2 pole with isi mark , pvc casing and caping 2 inch x 10 feet long with isi mark , pvc insulated copper wire single core 1 pt zero sqmm with isi mark 90mtr , pvc insulated copper wire single core 1 pt 5 sqmm with isi mark 90mtr , pvc insulated copper wire single core 2 pt 5 sqmm with isi mark 90 mtr , socket 6 amp with isi mark , switch 6 amp with isi mark , switch socket combined 16 amp with isi mark , long measuring tape 15m , mason thread , plastic long measuring tape 30m , tiles cutter machine comma rated input power 1450w with isi mark , wall putty with isi mark , water leveling pipe 1 by 4 inch , distemper white , fevicol ddl of 1 kg pack elephant mark , geru , lime unslacked , og paint enamel comma synthetic comma exterior paint olive green , paint black , paint po red , paint sky blue , paint white , painting brush 3 inch , painting brush 4 inch , painting brush 5 inch , thinner , wire brush , wood primer