Specifications:This stem extension mount is made of qualified aluminum alloy and plastic, solid, firm and durable to use.Direct wide slot user-friendly design, suitable for different specifications of the installation.Easy to install, suitable for many bicycle's stem.Great accessory for cycling enthusiasts.Item Name: Bike Extension BracketMaterial: Plastic + Aluminum AlloyFeatures: Durable, Easy to Install, FirmSize: Length: 8cm/3.15", Width: 4.2cm/1.65" (Approx.)Thread Diameter: 4.8cm/1.89" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Bike Extension Bracket2 x Screw1 x Mounting Base for Garmin1 x Mounting Base for Bryton1 x Mounting Base for Cateye1 x Mobile Camera Bracket1 x Flashlight Bracket