40mm Carbo Single Ratchet Block with Swivel Becket & Cam CleatCarbo Ratchets allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. Features:Sheave A~ (mm): 40 mmSheave A~ (in): 1-9/16 inMaximum line A~ (mm): 6 mmMaximum line A~ (in): 1/4 inMaximum working load (kg): 68 kgMaximum working load (lb): 150 lb