Material: Made of high-quality metal, practical and durable. Package contents: 1 bicycle chain cutter, 1 chain puller, 1 bracket puller, 1 freewheel puller, 1 crank puller. Chain puller: 3-in-1 function, sprocket whip wrench, hook lock ring tool, bottom bracket, used for removing and installing flywheel and axle. Chain cutter: Suitable for 7/8/9/10-speed 11-speed bicycle chains, effective for removing and installing bicycle chain link pins, smart design, easy to break, easy to reconnect. A good helper for bicycles: very useful and practical, suitable for mountain bikes / road bikes. Chain puller: 3-in-1 function: Open-end wrench, hook lock ring tool, and bottom bracket assembly tool in one, used for flywheel axle removal and installation. Bicycle Crank Extractor: Made of high-quality carbon steel, used to remove crankarms from the bottom bracket; all you need is a 16mm (5/8) wrench or adjustable wrench, very easy to install and use. Bottom Bracket Extractor: Made of high-quality,