supply of stores for ohp job no 6770 , indian standard medium beam 150x75mm , minimum weight 15 . 75 kg per meter with tolerance -2% to +5% confirming to is-808 ( part i ) - 1973 ( isi marked ) . the length of the ismb shall be 4 m . ismb shall be applied with one shop coat of red oxide primer . make: tata/sail , steel roofing trough isi marked 2400mm long made out of 2 mm thick @ 36 kg each with tolerance -2% to + 5 % , hot rolled carbon steel sheet confirming to is specification with 16 nos 12mm dia 40 mm long bolt , machine made ( heavy duty complete threaded with one nut and two washers of 30mm outer diameter and 3mm thick , per bolt , per srt . the overall width of srt shall be 613mm and height shall be 180mm . the srt shall be applied with one shop coat of red oxide primer the shape of srt shall be regular and angle of bending shall be maintained properly . the srt not found properly in shape shall be rejected . make: tata/sail , hdpe sand bags barrel type double stitched at one end std quality double colour brown and size 840mm x 360mm nylon with suitable tying cord as per is 14252/1995 . weight should not less than 85 gms as per sample approved by this regiment . , ldpe sheet conforming to is: 14611/1998 , 150 gsm of make: silpulin/supreme