... Socket, Torx, Rice character type, One Way etc.MaterialCarbon steel, stainless steel, SS-304, SS-302, Aluminum, Brass, Bronze, ... medium carbon alloy steel etc.Surface TreatmentZn-plating, Ni-plating, Cr-plating, ... the production of CNC/AUTO lathe, springs, shafts, screws, stamping parts and other metal parts. Our main ... kinds of screw ,machine screw ,stainless steel screw