40mm/29mm Carbo Traveler BlockLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Features:Sheave Ø (mm): 40 mmSheave Ø (in): 1-9/16 inMaximum line Ø (mm): 8 mmMaximum line Ø (in): 5/16 inMaximum working load (kg): 150 kgMaximum working load (lb): 330 lb