Ball bearing swivel bases feature dual rows of Delrin® ball bearings that swivel freely even underhigh loads. Bases include stand-up springs and a U-adaptor to accept a variety of appropriate blocks. The 144 is the standard configuration with a tall arm. It is ideal for mounting in the cockpit or for use on larger keelboats and small offshore boats that use 3.00 in (76 mm) plastic blocks.

Delrin® is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.

• Use with 57 mm / 75 mm / 2.25" / 3.00" / ratchets blocks