40mm Carbo Block with Spring EyestrapLow-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,(mm): 40 mmSheave Ø (in): 1-9/16 inMaximum line Ø (mm): 10 mmMaximum line Ø (in): 3/8 inMaximum working load (kg): 220 kgMaximum working load (lb): 485 lb