Swivel locks for Casters allow the user to quickly convert swivel casters from full mobility to rigid casters for straight-line tracking. If you require both the full mobilities that a swivel caster offers and the option for straight-line tracking that a rigid offers, a swivel lock is the perfect add-on to a swivel caster. A Swivel Lock allows the user to quickly alternate from a swivel caster to a rigid caster by a simple pull ring which engages a plunger into the swivel casters raceway notch preventing the caster from rotating and converting the caster into a rigid. When full mobility is required, simply pull the ring, and twist, and the plunger will retract from the caster and a full 360-degree swivel range will return. This High-Quality Bolt-On Swivel Lock bolts directly onto the popular 4" x 4-1/2" Top Plate. which are commonly seen on 2" wide casters. This bolt-on swivel lock fits any caster located within this category page HERE.These swivel locks work for any of our Swivel Plate Casters with a 4" x 4-1/2" overall top plate.