Material: Made of high quality metal, practical and durable. Package List: 1x Bicycle Chain Cutter, 1x Chain Remover, 1x Bracket Remover, 1x Freewheel Remover, 1x Crank Puller Remover. Chain Remover: 3-in-1 function, chin whip sprocket wrench, hook lock ring tool, bottom bracket, used for flywheel and axle removal and installation. Chain Cutter: Suitable for 7/8/9/10 11 speed bicycle chains, effective for removing and installing bicycle chain link pins, clever design, easy to break, easy to re-chain. Good Helper for Bicycles: Very useful and practical, suitable for mountain bike / road bike. Chain Remover: 3-in-1 Functionality: Open end whip wrench, hook lock ring tool and bottom bracket mounting tool in one, used for flywheel removal and installation and axle. Bicycle Crank Puller: Made of high quality carbon steel, used to remove the crank arms from the bottom bracket, all you need is either a 16mm (5/8) wrench or an adjustable wrench, very easy to install and use. Bottom Bracket