Features: Made of quality aluminum alloy and engineering plastics, solid, firm and durable to use. Direct wide slot user-friendly design, suitable for different specifications of the installation. Easy to install, suitable for any bicycle's stem. It is a extension mount holder for stopwatch and sports camera and other accessories. Great accessory for cycling enthusiasts. Easy and convenient to use. Bike Extension Bracket Set only,other accessories demo in the picture is not included. Specification: Material: Aluminum Alloy Size: app.8x4.2cm/3.15x1.65in(Detail size please see the pictures) Optional Color: Black, Blue, Red, Silver Quantity: 1 Set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Contents: 1 Set x Bike Extension Bracket