Anti-clog Strainer: The pop-up plug is designed with a built-in, anti-clogging SUS304 stainless steel strainer, which is durable and effectively prevents the drain pipe from clogging. With this drain plug, you don't need to worry about small objects such as rings and necklaces accidentally falling down the drain. In addition, you can clean the strainer without harsh chemicals by simply taking it out, wiping it off, and then putting it back in place. Easy to Install: This sink drain assembly comes with one heavy brass nut and two silicone gaskets. Ensure the gaskets are in the right position (refer to product instructions) to avoid leakage. The single-piece body is designed to prevent leakage and can be easily installed. Rustproof Body: The drain body is constructed of SUS304 premium grade stainless steel that has 18/8 chromium/nickel content to protect against corrosion and rust. Standard 1 3/4" Drain Opening: Fits sink holes with a diameter of 1.46” to 1.97” (37 to 50mm) and is for sinks with a thickness of 0.8" - 1.97” (20 to 50mm). The tailpiece diameter is 1.25" (32mm). Made for sinks with an overflow. Package Content: The package includes 2 x drain housings, 4 x gaskets, 2 x pop-up drains with strainer baskets, 2 x brass nuts, 2 x plumber's tapes, and installation instructions.