![Harken 57mm Quad Block Swivel, Center Becket [HSB380]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/1280x1280/products/28792/37572/88765XL__94692.1646204810.jpg?c=1 "Harken 57mm Quad Block Swivel, Center Becket [HSB380]")
![Harken 57mm Quad Block Swivel, Center Becket [HSB380]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28792/37572/88765XL__94692.1646204810.jpg?c=1 "Harken 57mm Quad Block Swivel, Center Becket [HSB380]")
57mm Quad Block Swivel, Center Becket
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.
Features:
- Sheave Ø (mm) 57 mm
- Sheave Ø (in) 2 1/4 in
- Maximum line Ø (mm) 10 mm
- Maximum line Ø (in) 7/16 in
- Maximum working load (kg) 1080 kg
- Maximum working load (lb) 2380 lb
![Harken 57mm Carbo Quad Block - Swivel [2631]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28793/37573/88766XL__88898.1646204813.jpg?c=1 "Harken 57mm Carbo Quad Block - Swivel [2631]")
![Harken 57mm Carbo Single Ratchet Block w\/Swivel Becket [2136]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28535/37134/84453XL__09779.1646201412.jpg?c=1 "Harken 57mm Carbo Single Ratchet Block w\/Swivel Becket [2136]")
![Harken 57mm Triple Carbo Block - Swivel, Becket, Cam Cleat [2141]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28811/37604/89302XL__30995.1646205191.jpg?c=1 "Harken 57mm Triple Carbo Block - Swivel, Becket, Cam Cleat [2141]")
![Harken 57mm Carbo Air Fiddle Block w\/Swivel Becket [2622]](https://cdn11.bigcommerce.com/s-akrdq0rr06/images/stencil/500x659/products/28317/36780/79073XL__59007.1646197485.jpg?c=1 "Harken 57mm Carbo Air Fiddle Block w\/Swivel Becket [2622]")