Features: 1.Theft protection: With special key (inner pentagon) prevents opportunity thieves from stealing your beloved bike parts. This simple alternative to the conventional quick release makes it much difficult for the thief, without special tools it does not get far. The advantages of the quick release are retained, however, because the removable clamping lever fits comfortably on your key chain. 2.Compatibility: Each bicycle that can be equipped with a simple quick release, is also compatible with our anti-theft device. Suitable for most bicycles, mountain bikes, trekking bikes or bicycle trailers. 3.Material: This bicycle accessory is very durable, as the lever is made of aluminium alloy and the axle is made of hard steel. Selected materials that optimally meet their specific tasks. 4.EASY ASSEMBLY: screw on the tensioner, lead into the axle, tighten with the quick release lever, and you're done. Keep your key safe and within easy reach. 5.Wide Use: The quick release wrench is not only an anti-theft key, but also can be used as a keychain, whistle, and valve. Specifications: Material: Aluminum alloy, steel Color: black, red, blue, gold Size: (Approx) Shaft diameter 5mm/0.19inch; front: 14.5cm/5.7inch; rear: 18.3cm/7.2inch Quick release wrench: 7.2cm/2.8inch Package Included: 1 Set x quick release lever Welcome to our store , hope you have a pleasant shopping experience