Heavy-Duty Retractable Workbench Swivel Caster Wheels 4-Pack a7

They are 360-degree freely pivoting casters with a simple, innovative, and secure foot pedal mechanism to elevate your workbench and move up to 600 pounds. When in the upward position, your workbench is not resting on the wheels, so you have a safe and stable work environment. If you wish to move your heavy bench, push the foot lever down and the bench is moveable. This package includes 4 caster wheels attached to lift brackets, hardware, and mounting instructions.