... 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 ... ,M12*11.9mm,1/4",3/8",5/16",1/2" )We hope to receive drawings or physical samples from you and we will quote ...