Features: Make of PVC, ensuring perfectly strength and reliability. Ball bearing design, smoothe driving. Easy installation: Simply adjust gate caster mounting position and fasten the screws, it is very simple. This feature absorbs vibrations and move smoothly on uneven surfaces. Spring loaded gate wheel is suitable for a wide ranges of terrain: concrete, dirt, grass. Enjoy smooth and efficient gate maneuverability with our 360 degree rotating casters, allowing easily movement in any direction. Specifications: Component: PVC Type: Left/Right Height: about 290.5mm/7.5inch Package Includes: 1pc Gate wheel 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.