Easy to Operate: Spring loaded push button does not require a lift rod. Simply push the drain cap down to close and to seal, push again to open and to drain water. Built-in Strainer: The anti-clogging basket strainer inside enables the drain stopper to collect hairs and prevent the drain from clogging up. Premium Material: Pop-up drain stopper, drain flange, threaded pipe are made of brass, tailpiece made of stainless steel. Metal construction for top durability. Industy-leading finish is corrosion & rustproof. Perfect Size: The sink drain fits standard US bathroom sink with 1-1/2" to 1-3/4 inch drain hole (1.45 to 1.96 inches). Easy Installation：All required gaskets, seals and brass mounting nut are included. Please make sure the gaskets are in the right position (please refer to product pictures or instructions) to avoid leakage.