57mm Triple Carbo Block - Swivel, Becket, Cam CleatCarbo Ratchets allow sailors to hand-hold loaded lines and offer a balance between holding power and controlled easing.Features:Sheave Ø (mm) 57 mmSheave Ø (in) 2 1/4 inMaximum line Ø (mm) 10 mmMaximum line Ø (in) 3/8 inMaximum working load (kg) 816 kgMaximum working load (lb) 1800 lb