[Wide Compatibility]Universal suitable for varia series radar tail light and edge series cycling computer, and for GS cycling computer, also can be a holder for .[Fit Different Size of Seat Post]Comes with 2 different size of rubber inserts, makes it widely fit for most bicycle, you can install the mount separately to the thicker seat post or install it with rubber insert to a thinner seat post.[Easy to Install with Included Tools] Wrench and Screws are included, convenient to mount your radar tail light or GPS cycling computer on the seat post or handlebar of your bicycle, increase safety.[Stable and Safe]The mount is on the bicycle securely by 2 screws included, can be fixed on your bicycle firmly, no worry of loose when riding. And shock absorbing rubber inserts is soft, anti- and scratch-proof, keep it stable on your bicycle and not easy to shake.[Designed with a Hidden Holder for ] This is a new version that increase a housing for , allow you to place tracker in the bracket with hidden positioning, protect it and do not block the signal of the anti-lost device. You can still install your tail light or cycling computer normally after place the tracker.Colour:blackMaterial:ABSPackage Contents:1 x bicycle saddle2 x screws1 x screwdriverOnly 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..Items from Sheng Xinshun's shop