CSK17 One-Way Clutch Bearing - Sprag Freewheel Backstop - 17x40x12mmCSK17 One Way Clutch Bearing Sprag Freewheel Backstop 17mm x 40mm x 12mm VXB Bearing The CSK17 is a one way (clutch) ball bearing designed to allow rotation in only one direction while preventing backdriving. Ideal for use in conveyor systems, washing machines, and mechanical applications where reverse motion must be avoided due to gravity or load conditions. Item: CSK17 Bearing Type: One Way Clutch (Sprag Freewheel Backstop) Inner Diameter (ID): 17mm