Carbo Ratchets allow sailors to safely handle loaded lines by providing a well-balanced combination of holding power and controlled easing. 40mm Triple Ratchet Block — Swivel, Cam Cleat Part No. 2612 Sheave Ø (mm) 40 mm Sheave Ø (in) 1 9/16 in Max line Ø (mm) 5 mm Max line Ø (in) 3/16 in Max working load (kg) 340 kg Max working load (lb) 750 lb