Harken Ball Bearing Swivel Mainsheet Cam BaseStandard Cam Base Swivel 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
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