... Head,Hexagon socket head , etc.3.Drive type: Slotted, Phillips, Hex 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, ... .en.alibaba.com all kinds of screw ,machine screw ,stainless steel screw and fasteners