![Harken 40mm Carbo Air Double Fixed Block w/Becket [2643] Electrical | Alternators High and low speed settings](https://cdn.shopify.com/s/files/1/0897/0466/1277/files/79740XL.jpg?v=1729317704)
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High and low speed settings for smooth
Caution: This approach sacrifices some “travel” in the existing adjustment arm so the BBU mechanism can be anchored to the arm
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Harken 40mm Carbo Air Double Fixed Block w/Becket [2643] Electrical | Alternators High and low speed settings40mm Carbo Air Double Fixed Block with Becket Low friction Carbo Air blocks are lightweight, strong, reliableand affordable. Companions to the popular Harken Black Magic block line, these small, compact blocks have very high working loads for safe, easy trimming. Specifications: Sheave (mm)40 mm Sheave (in)1 9 16 in Maximum line (mm)10 mm Maximum line (in)3 8 in Maximum working load (kg)440 kg Maximum working load (lb)970 lb