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 ; (mm): 40 mm Sheave ; (in): 1-9/16 in Maximum line ; (mm): 6 mm Maximum line ; (in): 1/4 in Maximum working load (kg): 68 kg Maximum working load (lb): 150 lb