Feature: Made of aluminum alloy + plastic, more durable The headset computer holder can be perfectly embedded into any bicycle with a front fork top tube diameter of 28.6mm. Aluminum bicycle computer base and bowl set cover suitable for-POLAR computer Specification: Product name: Suitable set For-code holder Material: Aluminum alloy + plastic Packaging: bagged Packing size: 8*13*1.3cm Weight with packaging: 30 grams Specifications: Suitable for all bicycles with a front fork upper tube diameter of 28.6mm Package Included: Bicycle water cup holder*1 Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data.