supply of rectangle hollow section-100x60x4mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-200x100x10mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-220x140x6mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-240x120x6mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-300x200x12mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-400x200x10mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-96x48x3.2mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-96x48x4mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-96x48x4.8mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-200x100x10mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-220x140x6mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ] , rectangle hollow section-400x200x10mm, length-11mtr. or above. yst 310 or higher ( as per is:4923-1997 ) erw. [ warranty period: 30 months after the date of delivery ]