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Sheave Ø (mm)40 mm

Sheave Ø (in)1 9/16 in

Maximum line Ø (mm)10 mm

Maximum line Ø (in)3/8 in

Maximum working load (kg)220 kg

Maximum working load (lb)485 lb


Low-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.

40 mm Block

SKU: 2650