... stamping part/Fastener/channel nut:Stainless Steel 304 or 316 channel spring nut:1.Material:stainless steel 304 or 316;or mild carbon steel;2.Surface treament: washing or polished,galvanized ... *6mm,M8*6mm,M8*8mm,M10*8mm,M10*9.1mm,M12*8mm,M12*9.1mm,M12*11.9mm,1/4",3/8",5/16",1/2"; SS304 or SS316 M12(1/2") channel spring nut