SOLID METAL CONSTRUCTION: The bathroom sink drain is made of high-quality brass and 304 stainless steel for high wear resistance. The luxurious and beautiful matte black finish resists corrosion, rust, scratches, and is smooth without tarnishing. SIZE: Please measure the sink hole before purchasing. Designed for vessel sinks without overflow, the sink strainer fits sink holes from 1.6" to 1.9" in diameter, sinks up to 1.9" thick, suitable for most of vanity / under-mount / vessel sinks and standard sized U.S plumbing. LEAK-PROOF DESIGN: The pop up drain features a three-piece sealing ring design, two thickened silicone gaskets and a plastic washer to ensure a tight fit between the drain and your sink, resisting oxidation and preventing leaks more effectively. SIMPLE INSTALLATION: The bathroom sink stopper is simple in structure and easy to assemble. Without any tools, anyone can install it by hand, just tighten the extension nut and the whole installation can be completed in a few minutes. EASY TO OPERATE: With a user-friendly design, the drain stopper can be opened and closed by simply pressing the drain cap. The button is big and drains quickly, and you can remove it by turning the top cap counterclockwise for easy daily cleaning.