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. Use the 2634 with a 402 or 403 swivel arm for a versatile two-speed mainsheet system.Specifications:- Sheave Ø (mm): 57 mm- Sheave Ø (in): 2 1/4 in- Length (mm): 116 mm- Length (in): 4 9/16 in- Weight (g): 204 g- Weight (oz): 7.2 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): 340 kg- Maximum working load (lb): 750 lb- Breaking load (kg): 851 kg- Breaking load (lb): 1875 lb- Holding power: 10:1