Features: Enables you to easily view performance data on your computer - compatible with either Standard handlebars (using the included rubber reducer) or Oversize handlebars. Heads-up positioning provides increased safety and compatible for Polar Smart GPS Bicycle Computers V650 M450. Put you and your data ahead of the pack with this new out-front bike mount. This mount allows you to take full advantage of all of the robust data that your cycle computer provides without compromising the ride. The mount is out in front of you for easier heads-up positioning and increased safety. Compatible Devices: for Polar V650 M450 GPS bike computer. Please ensure your computer is fully insured before using this mount on your bike. Specifications: Brand: Andoer Material: Plastic Clamp Diameter: 25.4mm / 31.8mm handlebars Color: Black Compatible Bike Computer: For Polar M450 V650 GPS bike computers Item Weight: 71g / 2.5oz Package Size: 14.5 * 4.5 * 4.5cm / 5.7 * 1.8 * 1.8in Package Weight: 75g / 2.7oz Package List: 1 * Holder for Polar GPS 2 * Rubber Reducer 2 * Hexagon Wrench Note: Bike computers are not included. 1 * Holder for Polar GPS 2 * Rubber Reducer 2 * Hexagon Wrench Note: Bike computers are not included.