... Steel; 2.Surface:Hot Dipped Galvanized; 3.Good price and quality; Metal stamping part/channel nutchannel nut(M6,M8,M10,M12,1/2",1 ... /4",5/16",3/8"): 1.Material:carbon steel;2.Surface treament:nickel plating,,zinc plating ... ,galvanized,hot dipped and so on;3.Stainless steel 304 or ...