... 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, Ni ... .en.alibaba.com all kinds of screw ,machine screw ,stainless steel screw and fasteners