Socket wrenches for mounting and dismounting various bottom bracket bushes are manufactured with precision using CNC machines. The socket wrenches are made of aluminium and are anodized red for a durable surface protection. The precise fitting prevents the outer bearing shells from being damaged. A roughened surface on the side of the wrench provides a better grip when the bearing shells are tightened by hand. In addition, the 3/8'' adapter makes it easy to work with torque wrenches, ratchets or other levers.