Vktech&reg; GUB G-329 Carbon Bike Bicycle Handle Bar Extender Mount Lamp Bracket Holder Super light CNC Aluminium body with a carbon extender bar Product characteristic: the 6061 aluminum alloy material CNC turning process Material: aluminum alloy 6061 + carbon fiber Suitable for installation handlebar diameter 31.8 mm (25.4 mm handlebar need to add gasket) Fixed the column diameter 22.2 mm