57mm Carbo Single Ratchet Block with SwivelCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.Features: On/off switch operates from both sides Standard grip: medium/light air; 10:1 holding power Sheave ; (mm): 57 mm Sheave ; (in): 2-1/4 in Maximum line ; (mm): 10 mm Maximum line ; (in): 3/8 in Maximum working load (kg): 227 kg Maximum working load (lb): 500 lb