Optiparts Optimist Halyard Block with Hook for Harken

The Optimist Halyard Block with an official Harken plain bearing block and hook as seen under Optiparts Sailing Spars online.Harken Ball bearing hook-in block as used on Blackgold racing masts. Due to the curved saddle, the block rests againstThe mast is in a fixed position, which prevents mast wear and creates a halyard system with less friction.