CSK40-2RS One-Way Bearing Sealed Sprag Freewheel Clutch BearingCSK40 2RS One Way Clutch Bearing Sprag Freewheel with Sealed Protection 40mm x 80mm x 27mm This CSK40 2RS bearing is a one way clutch (aka sprag freewheel) with rubber seals to keep out dirt and grease in. Built for applications that need rotation in one direction only think backstops, indexing drives, or overrunning clutches this things got you covered with solid torque and smooth engagement. Type: One way clutch (sprag freewheel) Inner Diameter