Use cam swivel bases when leads must rotate to face the trimmer.
Ball bearing swivel bases feature dual rows of Delrin® ball bearings that swivel freely even under high 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 76 mm (3.00 in) plastic blocks.
Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.