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.

Height (mm)
146 mm

Weight (g)
369 g

Minimum line Ø (mm)
3 mm

Maximum line Ø (mm)
12 mm

Fastener spacing (mm)
19 mm

Fasteners (mm)
5 FH mm

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