40mm Carbo Block 90° Fixed HeadLow-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): 10 mmMaximum line Ø (in): 3/8 inMaximum working load (kg): 220 kgMaximum working load (lb): 485 lb