The 2 in. Aluminum Single Belt Motor Pulley mounts to the drive shaft of a 56 NEMA electric motor. 56F, clawfoot motor, mounts on a flat-plate hoist. The pulley uses a set screw to secure the pulley onto the drive shaft. Machined from marine grade 6061-T6 US aluminum. The 5/8 in. center bore slides right on the drive shaft. The pulley mounts on every type of 56 electric boat lift motor BH-USA sales. The Motor key stock is not included with the pulley.