Ronstan Series 55 Ratchet Mount Orbit Block - Cheek Anti-Clockwise Rotation [RF56151A]Series 55 Ratchet Mount Orbit Block Cheek Anti Clockwise Rotation Features: Up to 20: 1 holding power Smooth easing of sheets High performance cleating Automatic & manual ratchet block Automatic ratchet block Now you can enjoy the flexibility of setting up your ratchet blocks to suit yourself. Ronstan is the only company that offers a ratchet block with both auto and manual engagement modes*. In the auto mode of the ratchet mechanism engages when load