These Conveyor Sheaves are designed to fit either a belt, rope or cable. For power transmissions, sheaves will most often utilize a belt. A Sheave, or belt drive is a method of transferring rotary motion between two shafts.  

A sheave drive includes one pulley on each shaft and one or more continuous belts over the two sheaves. This allows for mechanical power, torque, and speed to be transmitted across axes. If the sheaves are of different diameters, this ratio will create a mechanical advantage.