Harken 57mm Carbo Blocks have an enormous working range and a very high strength-to-weight ratio. This 57mm Carbo boom block has 6 sheaves. A swivel keeps the boom block aligned with your base block.

Specifications:

• 2380 lb. SWL
• 5000 lb. breaking strength
• 7/16" maximum line diameter
• 6mm shackle pin diameter