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.Specifications:- Sheave Ø (mm): 57 mm- Sheave Ø (in): 2 1/4 in- Length (mm): 125 mm- Length (in): 4 15/16 in- Weight (g): 431 g- Weight (oz): 15.2 oz- Shackle pin Ø (mm): 6 mm- Shackle pin Ø (in): 1/4 in- Maximum line Ø (mm): 10 mm- Maximum line Ø (in): 3/8 in- Maximum working load (kg): 816 kg- Maximum working load (lb): 1800 lb- Breaking load (kg): 2041 kg- Breaking load (lb): 4500 lb- Holding power: 10:1