... ball screw, hex screwbolt screw, bolts and nuts, self drilling screw, self tapping screw, machine screw, furniture screwdrywall screw, screw nut, ... steel, metal, brass, copper, zinc alloy, cold rolled steel with various plating 2) Head style: pan, round, flat, oval, ... 4) Standard/ specification: OEM service as per customers' requests, with in-house tooling design & fabricating; 5) RoHS compliance for ...