The original Harken block
Used for main and jib sheets on course racing keelboats, scows and dinghies with large mains. Often used for spinnaker halyards and sheets on small offshore boats. Swivel blocks feature a three-way head system with a set screw. Blocks with cams feature adjustable cam arms and reversible cam cleats. Where applicable, blocks use #8 fasteners.
- Sheave: Delrin
- Bearings: Delrin ball bearings
- Sheave Size: 2-1/4" (57mm)
- Line Diameter: 7/16" max.
- Cheek Material/Finish: Plastic/stainless straps
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