EC21 Product Catalogs - bs1449 part 2 http://www.ec21.com/ec-market/bs1449 part 2.html Nuts & Boltshttp://ritesh009.en.ec21.com/Nuts_Bolts--563321_905452.html2 Part 2 and can be used with all 41 mm wide channel which complies with BS6946. For maximum load capacity M12 channel 20060127 Cold Rolled Steelhttp://rico21.en.ec21.com/Cold_Rolled_Steel--6_2027934.html Specification Class JIS G3141 ASTM BS1449 PART1 DIN 1623 Commercial Quality( CQ) SPCC A366 CR4 20070627