... 1.Sprag Clutch Bearings 2.Certificate ISO9001.2008, 3.Material: Bearing steel, 4.Various size and type Sprag Clutch BearingsSprag Clutch is a one-way freewheel clutch. ... they lock with very little backlash.Applications: Automatic transmissions, Helicopters, Motorcycle, Starters, Primary drive, Conveyors, Overrunning, Indexing, Backstopping, Hoist load brake. Sprag Clutch Bearings with best quality