The bike handlebar extender made of 6061T6 aluminum alloy material with CNC machining and iii grade hard anodized surface Bar extensions length 8 203mm diameter 087 22mm The handlebar mounting clamp base accommodates handlebars 0875 inch22mm 1 inch 254mm 1125 inch 286mm 126 inch 32mm in diameter Come with three soft rubber ring inserts to provide a snug fit and protection of the mounting surface Rubber ring pads diameter 0875 inch22mm 1 inch 254mm 1125 inch 286mm You can add or remove them depending on the size of the handlebars When the rubber ring insert is not embedded the hole diameter of the handlebar clamp base is 126 32mm The mounting clamp base utilizes rubber insert and Lock bolt to prevent loosening in high vibration Set comes with an Allen key for easy installation Suitable for mounting to bike bicycle motorcycle scooter ATV handlebars as well as other round rails within the stated dimensions