Features:Three types for you to choose, one is compatible for Garmin, and one is for Bryton, and the last type is for CATEYE.Adopting tough plastic, lightweight and durable in use.Easy to mount onto the bike computer extension mount(Not included).Enabling your bike mount to install different brands of bicycle computer. Enriching your installation choice.A indispensable accessory in mounting your bike computer onto bike.Specification:Condition: 100% Brand NewMaterial: PlasticColor: BlackAll Diameter: Approx. 3.2cm / 1.3inThe Screw Hole Distance: Approx. 21mm / 0.8in(The adapter for Garmin, Bryton)Applicable Common Screw Type & Length(Not included): M3, 6mm / 0.24in(for Garmin, Bryton ), M3, 10mm / 0.39in(for CATEYE)Weight: Approx. 4gPacking List:1 x Bike Computer Mount Adapter Only* The screw, the bike computer mount all are not included.