40mm Carbo Air Double Fixed Block
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. 
Speciications:
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)440 kg
Maximum working load (lb)970 lb