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.  Also known as a Lopez Block it is great for sheeting systems and downhauls and regularly used on small keelboats such as the J24. Sheave Ø (mm) 57 mm Sheave Ø (in) 2 1/4 in Length (mm) 103 mm Length (in) 4 1/16 in Weight (g) 266 g Weight (oz) 9.4 oz Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Maximum working load (kg) 136 kg Maximum working load (lb) 300 lb Breaking load (lb) 750 lb Breaking load (kg) 340 kg Footnote Maximum working loads and breaking loads for blocks based on cam strengths. Shackle pin Ø (mm) 5 mm Shackle pin Ø (in) 3/16 in Holding power 10:1