57mm Triple Carbo Block - Swivel, Becket, Cam Cleat. Carbo Ratchets allow sailors to hand-hold loaded lines and offer a balance between holding power and controlled easing. Features: Sheave Ø (mm) 57 mm Sheave Ø (in) 2 1/4 in Maximum line Ø (mm) 10 mm Maximum line Ø (in) 3/8 in Maximum working load (kg) 816 kg Maximum working load (lb) 1800 lb. Finish Type: Powder Coated. Material: Plastic. Operation Mode: Mechanical. Includes components: Great Product. Item package quantity: 1. Package dimensions (from manufacturer): 7.83 x 6.81 x 3.19 inches; package weight approximately 0.45 kg (0.99 pounds).