Bicycle Cycle Road Bike GPS Computer Protective Silicone Case Protect Skin Case Bike Computer Mount Set for GPS Polar M450 for 31.8mm or 25.4mm Handlebars This set includes a computer mount that can be installed onto 31.8mm or 25.4mm handlebars with two shims provided and a silicone case to protect the bike computer. The silicone case is specially designed for GPS Polar M450 M460 and the mount is suitable for GPS Polar M450, V650 M460. it is a smart and perfect addition for your beloved bikes! Features:  Silicone case to protect your device for durability and longevity. Plastic durable mount for 31.8mm and 25.4mm diameter handlebar with two shims provided.  Easily view your performance data on your computer in a perfect position. 1/4 turn twist for mount/dismount the case, easy installation. Compatible devices: for Polar M450 M460 GPS bike computer. It is a really smart addition to your beloved bike computer! Specifications: Material: Plastic & Silicone  Compatibility: for GPS Polar M450 M460 Suitable for: 31.8mm or 25.4mm handlebars Weight 85.5g / 3.0oz  Package size: 20 * 13 * 1cm / 7.9 * 5.1 * 0.4in Package weight: 90g / 3.2oz  Package List: 1 * Bicycle Computer Mount  1 * Silicone Case 2 * Shim  2 * Hex Wrench Note： The computer displayed in photos is not included.