... shaped sprags are used. When the unit rotates in one direction the rollers slip or free-wheel, but when a torque ... is applied in the opposite direction, the rollers tilt slightly, producing a wedging action and binding ... , Starters, Primary drive, Conveyors, Overrunning, Indexing, Backstopping, Hoist load brake. High Quality Sprag Clutch Bearings DC 5476