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. The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless. 2x grip: breeze–on/puffs; 30:1 holding power Length (mm) 137 mm Length (in) 5 3/8 in Weight (g) 238 g Weight (oz) 8.4 oz Maximum working load (kg) 341 kg Maximum working load (lb) 750 lb Breaking load (kg) 1361 kg Breaking load (lb) 3000 lb Sheave Ø (mm) 75 mm Sheave Ø (in) 2 15/16 in Maximum line Ø (mm) 12 mm Maximum line Ø (in) 7/16 in Shackle pin Ø (mm) 6 mm Shackle pin Ø (in) 1/4 in Holding power 30:1