The Harken 57mm Carbo Air Block - Double with Swivel is a lightweight, strong and affordable block. They enable safe and easy sail trimming and are 30% lighter, with a 60% higher working load, than Classic blocks.
- Open Air Block design eliminates unnecessary material and weight
- Ball bearings, sheave, and side plates are UV stabilized with carbon black for maximum protection
- Patented switch locks shackle in front or side positions, or lets block swivel to keep line from twisting
- Designed for use with:
- Main/jib sheets
- Mainsheet fine-tune
- Control lines
- Maximum Working Load: 1584 (720 kg)
- Breaking load: 3300 lb (1500 kg)
- Sheave diameter: 2-1/4" (57 mm)
- Maximum line size: 7/16" (10 mm)
- Shackle pin: 1/4" (6 mm)
Note: do not use Harken Equipment for human suspension.