supply of aluminium extension ladder 15mtr , aluminium extension ladder 15mtr (45 feet on extended condition) fully extended (9.00mtr+9. 00mtr) (27 feet on closed condition) made of high tensile aluminium alloy with special rectangular tubing hav ing dual internal vertical supports for extra of size 77 x32 x2 mm and c shape size 15x12x3 mm confirming to he-30 grade t-6 temper as per is:733-1983 of hindalco make steel, steps to be made of no slip aluminium all oy, square corrugated fluted pipe of 28x3mm dia. & distance of 250 mm (10 inch) centre to centre. width of e xtension ladder min-310 mm (approx.) steps to be riveted at 305mm interval, with aluminium lm-6 catcher to lock ladder at every rung, pulley bracket complete with nylon rope of p.p. 10 mm, rubber shoes at the bottom safety, additional hook on top of the ladder , hook to be made of ms flat 32x5 mm, hook bending on 5 mm dia , ms guide pipe mixed inside the ladder at 1 meter interval for stability of ladder.as per specification attached [ warranty period: 30 months after the date of delivery ] ]