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.Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.SpecificationsMaximum line diameter: 1/2″ (12 mm)Minimum line diameter: 1/8″ (3 mm)Fastener spacing: 3/4″ (19 mm)Fasteners: #10 FH inch (5 FH mm)Use with: Big Bullet/Dinghy/2.25″/small ratchetsHeight: 4 5/16″ (110 mm)Weight: 14 oz. (398 g)Technical FileInstallation Sheet .input-wrapper a { text-decoration: none; / Removes underline / background-color: transparent; / Ensures no background color / } .input-wrapper a:hover { text-decoration: underline; / Adds underline on hover / background-color: transparent !important; / Removes grey highlight / }