The Centrifugal Clutches are suitable for a wide range of high speed applications. These clutches basically use centrifugal force to connect two concentric shafts, with the driving shaft nested inside the driven shaft. The input of the clutch is connected to the engine crankshaft while the output may drive a shaft, chain, or belt. Very useful with an engine that has trouble starting under load; these clutches are usually used in motor pulleys. In addition, these clutches are also used in chain saws and lawn mowers.