40mm Carbo Air Fiddle Block with SwivelLow-friction Carbo Air blocks 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.Specifications:Sheave: 40mm / 1-9/16inLength: 115mm / 4-1/2inWeight: 51g / 1.8ozShackle pin: 4mm / 5/32inMaximum line: 10mm / 3/8inMaximum working load: 220kg / 485lbBreaking load: 735kg / 1620lb