[Bottom Bracket Tool]:The bottom bracket wrench is used to mount and disassemble the central shaft and steering wheel of the bicycle. The size of the key is 165 x 30 x 7 mm or 6.5 x 1.2 x 0.3 inches. Adjustable pin key: the distance between the hook claws can be adjusted, the length of the hook claw is 35 mm or 1.4 inches, the maximum opening size is 62 mm or 2.4 inches. Compatibility: The bottom bracket wrench tool is suitable for most ordinary bicycles. Small and portable size, very suitable for transport and quick maintenance. Space-saving storage, non-slip design, easy to hold. [Material]: The key is made of high quality carbon steel for high strength, deformation resistance and durability.Small portable disassembly key with eight characters and center axis, ideal for transport and quick maintenance. [Function]:A professionally manufactured bicycle central axle disassembly key mainly used to install and disassemble the central axle and flywheel of the bike with high clamping force.