Brief Introduction: A Quick Release Skewer is a mechanism for attaching a wheel to a bicycle. It consists of a rod threaded on one end and with a lever operated cam assembly on the other. The rod is inserted into the hollow axle of the wheel, a nut is threaded on, and the lever is closed to tighten the cam and secure the wheel to the fork. Wheels equipped with quick release can be removed from the bicycle frame and replaced without using tools by opening and closing the cam lever, thus it is more convenient than wheels with solid axles and nuts. Bike disassembly or assembly is no longer a hassle when you have this Kactus Bike Quick Release. Main Features: Lock the bicycle hubs and front fork, keep the wheels from falling out It is assembled and dismantled by 4mm inner hexagonal spanner Anti-rust anode processed, durable service With high temp resistant washer Specifications: Material: CNC Titanium and 7075 aluminium alloy Max. torque: 7nm Front: 75 / 100mm, size is 15 x 1.8 x 1.8cm ( L x W x H ) Rear: 130 / 135mm, size is 18.5 x 1.8 x 1.8cm ( L x W x H ) Hollow tubules axle: 4mm diameter Compatibility: Bike, road bike and mountain bike Caution: Incorrect installation can cause serious injury. Installation should be done by a trained bicycle technician only.   Brand Name: Kactus Type: Quick Release, Other Accessories Material: CNC Titanium, 7075 Aluminium Alloy Suitable for : Bike, Mountain Bicycle, Road Bike Color: Silver, Red, Blue, Gold, Black   Package weight: 0.123 kg Package size (L x W x H) : 25 x 13 x 2 cm / 9.83 x 5.11 x 0.79 inches Package Contents: 2 x Kactus Road Bike MTB Quick Release