40mm Double Block - Swivel. Low-friction Carbo Air blocks are lightweight, strong, reliable--and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.

Sheave O (mm) 40 mm

Sheave O (in) 1 9/16 in

Maximum line O (mm) 10 mm

Maximum line O (in) 3/8 in

Maximum working load (kg) 440 kg

Maximum working load (lb) 970 lb