This handlebar extension is suitable for mounting on the motorcycle rear view mirror frame or other compatible screw heads. Aluminium alloy crossbar, length 4 inches (103 mm), diameter 0.87 inches (22 mm). Mounting base with 10mm hole, stainless steel material. The handlebar extension with two M6 and two M8 screw holes to extend your application installation as much as possible. The kit includes an Allen key for easy installation. This item has CNC production process, solid structure and smooth surface.