This T type bicycle bracket is a very good accessory. It can use a bicycle lamp or stopwatch. It is easy to install and remove without any tools. It is suitable for any bicycle frame lamp and can effectively improve your riding safety. This is a useful tool for bicycle lovers. It can be mounted on a seat tube or a handlebar. Install on your bicycle handlebar, add extra storage space for your bicycle lights, GPS or telephone. Suitable for installation of handlebar diameter 31.8mm (25.4mm handlebar need to add cushion ring). The fixed column diameter is 21.2mm / 8.35 inches. Specification: Material: Aluminum-alloy Application: all parts and screws on the bicycle can be applied. And it is easy to carry Color: Black Suitable for 31.8mm handlebar use with small non-slip skin. Suitable for 25.4mm handlebar use big non-slip skin. Super light Aluminum body with extender bar. Use: Can be used in flashlights, stopwatch, speakers and other extensions installed. size: 200x22x22mm Included: 10 x Double Handlebar Frame Extension Mount 20 x Holders Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.