A leveling caster can go up or down, moving the equipment it's attached to along with it. Roll Heavy Equipment with Ease?Without built-in wheels in heavy types of equipment, moving it from this side of your workspace to another could prove to be a real trial, the total heavy-duty leveling retractable caster set of 4 can support load capacity up to 3300 lbs, when 4 Nefish swivel leveling casters are placed underneath the equipment, you'll be able to roll it to its destination, possibly by yourself. Absorb Shocking and Reduce Vibrations? If you are unable to concentrate on your work due to an unstable workbench, Nefish's leveling casters can give you a stable working environment. Nefish black leveling plate caster wheels are made of rubber pads, stainless steel stamping top plate, and an aluminum body. Once plate leveling casters are installed, the rubber pads can absorb the vibrations from the device while it's in operation. Nefish retractable casters use an anti-vibration rubber pad to secure them to the floor. Once the pad is lowered, the application will not move. Unlike a locked swivel caster, the pad won't wobble and will remain stable. Suitable for heavy workbench, kitchen island, machine equipment, medical machinery, communications equipment, heavy furniture, cabinet, etc.