Perfect for sheet turning blocks. This block is free wheeling at low wind velocity. As the wind velocity increases the pressure on the sheave automatically engages the ratchet. The sheet rope is never trapped in the sheave and can slide out the same as any other ratchet block without first pulling in and then releasing. 55mm sheave.

Automatic and Manual ratchet in one!

20:1 holding power

Easily fitted and securely retained

Stainless swivel shackle

Smooth easing of sheets