Ball bearing swivel bases feature dual rows of DelrinÆ 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.
I called your store, salesman was very helpful. The part was in stock and I had it the next day in time for my weekly racing. Thank you for the prompt service.