bids are invited for portable collapsible protective wall baskets, galvanished welded mesh frame as per specification under job no 2510 op tr , heavy duty rcc hume pipe type np-3 of 1000mm as per store list for drainage and culvert , cement opc 43 grade packed in hdpe bag each 50 kg wt as per store list for drainage and culvert , coarse sand free from vegetation for drainage and culvert , coarse aggregate 40mm graded for drainage and culvert , cement opc 43 grade packed in hdpe bag each 50 kg wt as per store list for retaining wall , coarse sand free from vegetation for retaining wall , coarse aggregate 40mm graded for retaining wall , stone boulder 9inch to 12inch for retaining wall , pvc pipes 75 mm each 3 mtr long make-prince,finolex,supreme for retaining wall