➤ Deck Plate Made of ABS material, anti-aging, anti-corrosive, ultraviolet resistant. ➤ Inside Diameter: 4"/6"/8".For standard calipers, please allow 1-2mm difference. ➤ Weather-tight and O-ring sealed deck plates are ideal for interior and exterior applications. ➤ Reinforced design with a non-slip surface,Separate cover plate and chassis, easy to install. ➤ If you have any questions about our products, please feel free to contact us. We will provide the best service.