provision of operational stores , steel roofing trough ( srt ) . steel roofing trough ( srt ) isi marked 10 feet long made out of 2mm thick . @ 47 . 89/kg each with tolerance -2 to +5% , hot rolled carbon steel sheet conforming to is specification with 16 nos 12mm dia 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 maintaned properly . the srt not found properly in shape shall be rejected . make : sail/ tata/jindal , steel roofing trough ( srt ) . steel roofing trough ( srt ) isi marked 6 feet ong made out of 2mm thick . @ 27 kgs each with tolerance -2 to +5% , hot rolled carbon steel sheet conforming to is specification with 16 nos 12mm dia 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 maintaned properly . the srt not found properly in shape shall be rejected . make : sail/ tata/jindal , steel roofing trough ( srt ) . steel roofing trough ( srt ) isi marked 8 feet long made out of 2mm thick . @ 37 kgs each with tolerance -2 to +5% , hot rolled carbon steel sheet conforming to is specification with 16 nos 12mm dia 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 maintaned properly . the srt not found properly in shape shall be rejected . make : sail/ tata/jindal , cgi sheet 12 feet x 3 feet x 0 . 63mm thick with galvanished of 175 grade of zinc coating ( galvanisation as per is-429 ) make : sail/tata ( isi marked ) , cgi sheet 10 feet x 3 feet x 0 . 63mm thick with galvanished of 175 grade of zinc coating ( galvanisation as per is-429 ) make : sail/tata ( isi marked ) , cgi sheet 8 feet x 3 feet x 0 . 63mm thick with galvanished of 175 grade of zinc coating ( galvanisation as per is-429 ) make : sail/tata ( isi marked )