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 mmSheave Ø (in)1 9/16 inLength (mm)115 mmLength (in)4 1/2 inWeight (g)51 gWeight (oz)1.8 ozShackle pin Ø (mm)4 mmShackle pin Ø (in)5/32 inMaximum line Ø (mm)10 mmMaximum line Ø (in) 3/8 inMaximum working load (kg)220 kgMaximum working load (lb)485 lbBreaking load (kg)735 kgBreaking load (lb)1620 lb