Low-friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.SpecificationsSheave (in): 2 15/16″ ( 75 mm )Length (in): 6″ ( 152 mm )Weight (oz): 20.5 oz. ( 580 g )Maximum line (in): 9/16″ ( 14 mm )Maximum working load (lb): 3639 lb ( 1650 kg )Breaking load (lb): 10000 lb ( 4535 kg )Shackle pin (in): 5/16″ ( 8 mm )Technical FileInstruction Manual .input-wrapper a { text-decoration: none; / Removes underline / background-color: transparent; / Ensures no background color / } .input-wrapper a:hover { text-decoration: underline; / Adds underline on hover / background-color: transparent !important; / Removes grey highlight / }