1. Complete Bike Chain Repair Kit: Whether at home or on the road, our bike chain repair kit comes with everything you need to repair the bike chain yourself.Each package comes with bicycle link pliers, chain wear indicator and checker, and a chain breaking tool2. Quick connection and disassembly: This professional bicycle kit comes with a bicycle link pliers that can quickly and easily disassemble and attach the links in your bicycle chain.It allows you to open and close the chain connector, while the non-slip handle provides a firm grip and more control3. Easy to break and recycle: The bicycle splitter with chain hook makes disassembly and insertion of the pin into the bicycle chain easier and faster, while holding it firmly in place and preventing it fromto move.It is compatible with 7, 8, 9, 10, 11 and single speed bicycle chains and can be mounted and disassembled with pins4. Chain Wear Indicator: To help you understand when you need to replace your bike chain, we provide a chain wear checker and indicator to assess the condition of the chain.5. Easy to use, if 0.75 or 1.0 teeth go through the chain, it's time to replace them