EC21 Product Catalogs - mild steel c channels pictures http://www.ec21.com/ec-market/mild steel c channels pictures.html Nuts & Boltshttp://ritesh009.en.ec21.com/Nuts_Bolts--563321_905452.htmlCHANNEL SPRING NUTS & FLAT PLATE BRACKETS:- Flat Plate Brackets are made of 6mm thick mild steel complying with BS970, 20060127