57mm Single Carbo Ratchet Cheek BlockCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing.Features:Sheave (mm): 57 mmSheave (in): 2-1/4 inMaximum line (mm): 10 mmMaximum line (in): 3/8 inMaximum working load (kg): 227 kgMaximum working load (lb): 500 lb