... mild steel; 2.Surface:polished;galvanized; 3.Competitive price and best quality; Metal stamping part/Fastener/channel nut:Stainless ... or 316 channel spring nut:1.Material:stainless steel 304 or 316;or mild carbon steel;2.Surface treament: ... Size: M6,M8,M10,M12,1/4",5/16",3/8",1/2");4.Competitive price and good quality;5. ... .1mm,M12*11.9mm,1/4",3/8",5/16",1/2"; SS304 or SS316 M12(1/2") channel spring nut