Lamp Tooth Tube M10 M12 M16 M20 M25 Hollow Tube Pipe Thread Tube Straight Tube Zinc Tube External Outer Thread Tube for Lamp Name: Lamp Tooth Tube Size: M10 (1 thread) , M12(1 thread) , M16 (1 thread), M20(1 thread), M25 (1 thread) Material: Zinc Plating Size: 1cm~20cm (If desire various length , please contact the client service,thanks)