1.freewheel sprocket 2.Certificate ISO9001.2008, 3.Material: Bearing steel, 4.Various size and ... rollers tilt slightly, producing a wedging action and binding because of friction. The sprags are spring-loaded so that they lock ... , Primary drive, Conveyors, Overrunning, Indexing, Backstopping, Hoist load brake. High quality freewheel sprocket of sprag freewheel