Harken 40mm Carbo Air Fiddle Block w/Swivel 
40mm Carbo Air Fiddle Block with Swivel
Low-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.
Sheave: 40mm / 1-9/16in
Length: 115mm / 4-1/2in
Weight: 51g / 1.8oz
Shackle pin: 4mm / 5/32in
Maximum line: 10mm / 3/8in
Maximum working load: 220kg / 485lb
Breaking load: 735kg / 1620lb
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