Features: Casters have a ratchet arm ergonomically designs to save effort and improve efficiency when adjusting the height of the industrial leveling caster. If you is unable to concentrate on your work due to unstable workbench, industrial leveling casters can give you a stable working environment. Once plate leveling casters is installed, the rubber pad can absorb vibrations from the device while it's in operation. Suitable for heavy workbench, kitchen island, machine equipment, medically machinery, communications equipment, heavy furniture, cabinets. The caster wheel is quiet, protect floor, and provide a cushioned ride. Specifications: Materials: Polyamide Styles: 80FD/60FD 80FD size: about 23x17x10cm/9.06x6.69x3.94inch 60FD size: about 27x19x11cm/10.63x7.48x4.33inch Package Includes: 4Pcs Leveling Casters note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.