Harken - 57 mm Ratchet Block

Power3 ratchet blocks provide sailors that race small one-designs with three holding-power options to handle a variety of wind and sea conditions. More choices allow sailors to fine-tune their set-ups in tandem with the purchase that provides the ideal level of power, responsiveness and grip. 

On/off switch operates from both sides. 

2x grip: big breeze/steady: 20:1 holding power