Hot sale screw e27 crawler socket ceramic lamp base, e27 socket lamp accessories bulb holder lamp e27

1: copper plated aluminum screw shell, copper plated iron contact and zinc alloy terminal block

2: copper plated iron screw shell, copper plated iron contact and zinc alloy terminal block 

3: copper screw shell, copper contact and copper terminal block

4: nickel plated copper screw shell, nickel plated copper contact and nickel plated copper terminal block

5: more other metal material

crawler socket,crawler socket adapter,crawler socket alternative, crawler socket connector,crawler socket electric,crawler socket factory,crawler socket for sale