Featrues 1. The stem cap is made of high quality aluminum alloy, durable and long service life. 2. You can be installed the top cap on your bicycle pole, it can install different types of computers, easy to install and easy to use. 3. It is suitable for the diameter of the stem tube about 28.6 mm. 4. Suitable for cat eye computers for Garmin, for viGPSPORT, for Blackbird and for Bryton. 5. Great accessories for road bicycles and mountain bikes. Specification Material: Aluminum +304 Stainless Steel Screws + Plastic Color: Black Suitable for Valve Stem Diameter: About 28.6 mm / 1.1 inches Suitable Model: for Garmin, for viGPSPORT, for Blackbird, for Cat Eye, for Bryton Process: CNC anode Package Include: 1 x Bicycle Computer Holder 3 x Adapter (For GARMIN, Bryton, CATEYE)