Harken 75mm ESP Single Block with swivel allows either a 2:1 or 3:1 purchase.Designed to handle the high loads generated by modern racing and cruising boats, ESP blocks feature sleeve bearings to ensure smooth, hitch-free performance under high load and heavy winds. Simple design and construction for handling high static loads on cruising boats. Ideal for halyards or limited purchase systems on cruising boats. Aluminum or polished stainless steel.Key FeaturesCarbon-black Torlon ball bearingsLong-glass engineered plastic SheaveContained-axle sleeveStainless steel swivel shackleSheave Diameter: 3" (75 mm)Max. Line Diameter: 3/4" (19 mm)Max. Working Load (MWL): 3500 lb. (1587 kg)Breaking Load: 7000 lb. (3175 kg) Weight: 12 oz. (340 g)Length: 6 1/4" (159 mm)