supply of aluminium extension ladder, featuring an [ aluminium extension ladder, featuring an extended height of 11.2 m and a closed height of 6 m, fabricated from aluminium alloy 63400-t6. , aluminium extension ladder, featuring an extended height of 11.2 m and a closed height of 6 m, fabricated from aluminium alloy 63400-t6. the ladder shall have side members with a minimum cross -section of 66.6 x 31.75 x 4 mm and 25.5 mm diameter corrugated round aluminium tube rungs, spaced at 300 mm centre-to-centre. it shall be equipped with a pulley and pp rope arrangement, a gravity pawls locki ng mechanism, non-slip rubber shoes, and suitable top hooks for safe operation. additionally, the ladder m st have a minimum load-carrying capacity of 150 kg and conform to is 4571:1977. the supplier shall submi t a manufacturers/oems test or compliance certificate confirming the specified material, dimensions, load capacity, and conformity to the relevant standard. [ warranty period: 30 months after the date of deliver y ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]