Floor and ceiling plates also known as escutcheon plates are used to cover and close the gap between the outside diameter or the pipe and the inside diameter of the wall, floor, or ceiling opening to avoid damage and leakage. This Floor and Ceiling Plates are designed for use in tubular drain applications. Please measure your pipe accordingly and make sure that it matches the measurements on this description. It Fits 3/8 inch IPS (3/8" Outside Diameter) Galvanized Pipe or 1/2 inch (1/2" Outside Diameter) Copper Pipe. Hole diameter is 0.625 inch (15.88mm) and outside diameter is 2.83 inches (72mm). It also has a wide range of application. You can install it for your faucet, toilet, sink, radiator, heater, pvc pipes, gas pipes, and many more. Experience a hassle free installation with no expert plumbing skills or tools needed. Simply split the flange to fit the pipe circumference and close the ends together to lock and protect the pipe and wall, floor, or ceiling opening from any damage and leakage SPECIFICATIONS Hole Diameter - 0.625 inch Outside Diameter - 2.83 inch Chrome Finish