Features1The flywheel and hub is locked by the flywheel cover. 2The cassette flywheel disassembly socket can be split into several pieces, the speed can have 7/8/9/10/11/12 speed. 3The key teeth of the cassette flywheel sleeve are shorter and the key teeth are thicker. 4The key teeth of the rotating flywheel sleeve can not be separated, its key teeth are longer and more thin. The whole is locked to the flywheel by the bottom thread. 5Made of steel material, sturdy and durable. 6Great bicycle flywheel tool for you.SpecificationItem Type: Flywheel Disassembly SocketMaterial: SteelColor: silverFor cassette flywheel size: approx. 4x2.5cm/1.57x0.98inchFor rotating flywheel size: approx. 4.5x2cm/1.77x0.79inchSpecificatios:For cassette flywheel: For 7-12 speed cassette flywheel disassemblyFor rotating flywheel: For 6-10 speed rotary flywheel disassemblyPackage List2 x Flywheel Disassembly Socket