Bike Extension Mount VGEBY Aluminium Alloy Cycling Odometer Extension Mount Bike Computer Adjustable Holder Accessor Specifications: Material: Aluminium Alloy + Plastic Options: Black-for Garmin; Red-for Garmin; Silver-for Garmin; Black-for Bryton; Red-for Bryton; Silver-for Bryton Quantity: 1pc Mount Size: approx. 8 x 3.5 cm / 3.14 x 1.37 inch Hole Diameter: 28.6mm (Suitable for 28.6mm bike stem) Thickness: Approx. 5mm/0.2in Weight: approx. 19g Package Included: 1 x Bike Odometer Extender Notes: for Garmin (suitable for Garmin 1000/820/810/800/520/510/500/200) for Bryton (suitable for R530/R330/R310/R100)