Universal Size: This basin is a universal stainless steel product with spring core, which can be used for various types of basin drains. The inner diameter of the sink filter is 37mm, suitable for drain holes with an inner diameter of 38-43mm. Easy Installation: No tools are required, installation can be easily done with bare hands, just remove the old rebound core and install a new rebound core. Due to its simple structure, anyone can install the pop up drain. If you want to use it for a larger diameter, you can use the rubber ring we provided to enlarge the inner diameter of the sink plug. Premium Material: The drain plugs are mainly made of high quality stainless steel and thickened copper - durable, rust-proof, crack-resistant. Thanks to its good bounce and bounce resistance, the water drains quickly and closes quickly. Built-in Strainer: The sink plug has an anti-blocking basket inside, which can collect hair and prevent leakage, providing effective cleaning and filtering unlike