bids are invited for heavy duty movable platform wheels - heavy duty industrial rubber wheel system to bear weight upto 1.5 to 2 ton with locking system and guide rod of 22 ft for linear movement , heavy duty structural scissor joints - high tensile (mild steel) scissor linkages expendable to length 22 ft and width of 16 ft with vertical clearance 10 ft , tarpaulin 30x30 , heavy duty frame works structure - high grade tensile fastners to secure the frame work structure of collapsible shelter , heavy duty pillars to support frame - heavy duty rust protected mild steel square rectangular hollow section prefabricated pillars to support frame size 22 length x 16 width x 10 height