Taper bushes are standardized elements, tried and tested in millions of applications in all different industries, offering cheap, easy and fast  installation and removal of  sprockets, pulleys and couplings to shafts with standard sizes. Their specific design ensures a secure locking between the bushing and the shaft, as well as between the conical surfaces of the bush  and the hub.  The high-strength screws ensure that the joint does not overturn. This allows for higher torque motion on a bidirectional drive, eliminating the risk of fretting, which often happens with standard key joints.