1. Effective Resistance to Oxidation and RustTop surface of the bathroom drain is made of SUS304 stainless steel with multiple layers of matte black finish. And the bottom pipe is made of high-quality PP. Compared to other types of metal drainers, this combined construction more superior corrosion resistance, rust proof, and durability. 2. Universal Bathroom Sink Stopper with Overflow Suitable for US standard 1.75" drain opening hole. Our black bathroom sink drain applicable sink hole diameter Range: Min 1.57"(40mmto Max 1.97"(50mm), fits most above-counter basin with overflow. 3. Built-in Anti-clogging Strainer BasketThe black pop up drain strainer basket hair catcher effectively filters hair and other debris to prevent clogging. Prevent bracelets, necklaces, earrings, and other jewelry from falling into the drainer. The basket is easy to remove, just gently lift the top cover, and you can clean the basket. 4. Integrated Design, NO LeakIntegrated black bathroom sink drain and double premium thickened silicone sealing gasket, anti-oxidation, not easy to harden and damage, long life. Press Smooth, Not Stuck. Exceeds U.S. Life Cycle Testing Standards. Open-close cycle press > 50,000 times.