Part No. 2654 Low-friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Sheave (mm)40 mm Sheave (in)1 9/16 in Length (mm)94 mm Length (in)3 11/16 in Weight (g)170 g Weight (oz)6 oz Shackle pin (mm)5 mm Shackle pin (in)3/16 in Maximum line (mm)10 mm Maximum line (in)3/8 in Maximum working load (kg)660 kg Maximum working load (lb)1455 lb Breaking load (kg)1383 kg Breaking load (lb)3050 lb