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 sidesStandard grip: medium/light air; 10:1 holding powerSheave A~ (mm): 57 mmSheave A~ (in): 2-1/4 inMaximum line A~ (mm): 10 mmMaximum line A~ (in): 3/8 inMaximum working load (kg): 227 kgMaximum working load (lb): 500 lb