Necessary Mountain Bike Repair Tools: All of these 4 bike disassembly tools are made of heavy-duty carbon steel. Premium and practical. For installing and removing the inner or bottom bracket on the bike. Includes 1 bike chain breaker, 1 crank puller, 1 bottom bracket puller, 1 sprocket puller. Bicycle Chain CutterUse to easily remove and replace chain pins. It comes in a compact design and it is the perfect chain tool. Common 7/8/9/10 speed bicycle chains. Compatible with all common bicycle chains. Crank Removal ToolThe 20-tooth crank puller is suitable for any splined 20-tooth crankset. Works with 24mm socket wrench or 1/2" screwdriver. Bike Crank PullerEasy to install and simple to use. The crank disassembly tool is used to remove the square type crank arms.The bottom bracket puller can be used with a 24mm wrench or adjustable wrench. Freewheel pullerThe freewheel cassette disassembly is used to remove many freewheels and other tour wheels from mountain bikes and road bikes.The locking ring tool has 12 teeth.Must be worked with a 24mm wrench.