HARKEN 57 mm Cheek Classic Block, 013 3 Sheave Bullseye Swivel Base with 365

Bullseye Swivel Base with 365 Carbo-Cam are simple swivel bases for main and jib sheets on very small boats or for control lines on boats of all sizes

Schaefer Stand-Up Swivel block allows full rotation and articulation

Ultra-high strength-to-weight ratio for high loads

investment cast

Glass-filled nylon handle halves are welded together for extreme stiffness

HARKEN 57 mm Cheek Classic Block, 013 3 Sheave Bullseye Swivel Base with 365Strong, 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 boats style. Classic blocks come in multiple sizes, and dozens of configurations and are ideal for almost every trimming task. Ball bearings, sheaves, and sideplates are UV stabilized with carbon black for maximum protection. Stainless steel straps reinforce blocks and resist