UNIVERSAL: the chain removal is suitable for most bicycles, easy to use in 7/8/9/10 speed chain, so you never have to worry about buying a different tool for your domestic bikes EASILY USER: Get your bike chain attached easily using this breaker Easy to remove link, easy to reinstall the link. Align everything correctly and press the pin and remove the link, take your time to put the chain back in place, line it up and push the link pin into COMPACT PORTABLE: This bicycle chain stripper is in a compact design and portable for transport at any time Specification: The design for quick and precise removal and installation of chain pins. In addition to superior strength and durability, it features a handy release shelf for repairing rigid links after reassembly. The fine thread and the right size make it easy to remove the toughest pins. Easy to break, easy to re-chain, special groove on the top, easy to see how far you pulled out the dowel and remove the chain cut with the dowel of the tool. You no longer need to exert tremendous force to remove the chain pins from your bike. The handy bicycle tool fits the following: 7/8/9/10 speed common bicycle chains, Works for all common bicycle chains. Unscrew both ends of the screw. The socket screw (opposite the pin) should be screwed in to support the chain as you twist the handle and apply pressure to push the pin back. Screw in the screw on both sides and continue to screw until the chain pin is cut.