Tender For supply of "high tensile alluminium alloy extension ladder 11.2 mtrs.height,side made of 'c' section of size 66.68x31.75x4 mm thickness,step made of 25.4 mm dia corrugated round tube fixed at a distance of 300 mm center to center having 4" overlapping with pully,gravity powell, locking arrangment, hooks at the top,good quality rope, rubber shoes, having closed height 6.096 mtrs.and extended height 11.2 mtrs., conforming to is:4571/1977 or latest and cee specification no. cee/nr/8/98. [ warranty period: 30 months after the date of delivery ]