Schaefer Half-Moon Mast Base Blocks provide a strong and smooth option for leading your hayards and control lines to
the sailboat cockpit. Choose from four different models, all featuring a heavy duty S.S. cage, polished and buffed to a
mirror finish. Sheaves are machined aluminum and run on Schaefer's self-lubricating Nomex™/Teflon™ Bearing. UC
models incorporate Delrin™ Ball Bearings for additional friction reduction.