Low-friction Carbo AirBlocks® are lightweight, strong, reliable—and affordable. Companions to the popular Harken® Black Magic® line, these small, compact blocks have very high working loads for safe, easy trimming. Sheave Ø (mm)75 mm Length (mm)137 mm Weight (g)195 g Shackle pin Ø (mm)6 mm Maximum line Ø (mm)14 mm Maximum working load (kg)550 kg Breaking load (kg)1650 kg