Set screw allows shackle to be fixed or to swivel.
Harken Small Boat Classic
Strong, dependable, and exceptionally free running, these blocks are the foundation of the Harken line, with a vast library of hardware choices available to complement your boat’s style. Classic blocks come in multiple sizes, dozens of configurations and are ideal for almost every trimming task. Ball bearings, sheave, and sideplates are UV-stabilized with carbon-black for maximum protection. Stainless steel straps reinforce blocks and resist corrosion.
Shackle blocks lock in two directions or swivel to keep line from twisting
Fast trim and release under load
Free-running ball bearings roll on flat races with minimal friction.
