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. The 40 mm fiddle is an excellent choice for 3:1 and 4:1 tackles on dinghy vangs and mainsheets, as well as for controls such as cunninghams and internal boom outhauls on larger boats. Sheave Ø (mm)40 mm Length (mm)131 mm Weight (g)128 g Shackle pin Ø (mm)4 mm Maximum line Ø (mm)6mm Maximum working load (kg) 204 Breaking load (kg) 680