Midrange Block’s robust construction makes them ideal to handle the high loads found on medium and large offshore boats. Sheave runs exclusively on a ball bearing system for fast trim and release under any load. Specifications Sheave diameter: 3″ (76 mm) Shackle pin diameter: 5/16″ (8 mm) Maximum line diameter: 9/16″ (14 mm) Maximum working load: 2800 lb (1270 kg) Breaking load: 7000 lb (3175 kg) Length: 7 1/2″ (191 mm) Weight: 25.5 oz. (723 g)