3 3/8 inches in diameter. The splash guard is perfect for Waste King, Whirlaway, GE and other EZ mount disposals. The drain cover is made of EPDM rubber, which is better than ordinary rubber. EPDM rubber has excellent oil resistance, aging resistance, cold resistance and high temperature resistance. The working temperature range is about -50?~+150?. Best choice for replacing dirty and old sink backsplash. Splash guards keep water and debris from splashing upwards, reducing noise when disposing of trash. It can bring you a more enjoyable and easier kitchen experience. Due to its good compatibility, this sink backsplash is extremely easy to install. The drain hole design is suitable for various preparation and cleaning tasks, allowing water to flow smoothly through the drain. The product is easy to clean, easy to install and disassemble. Make your life convenient. We provide hassle-free 12-month warranty and 24-hour customer service. If there is any dissatisfaction with the product, or parts are missing, please feel free to contact us, whether it is a new one or a refund, we will definitely give you a satisfactory answer.