Description: 1. Material: brass 2. Inner Diameter of Drainage Hole: 34mm-40mm 3.Package Includes:1* Bathroom Sink Drain Stopper Features: Pop-up drain filter design subverts traditional and inconvenient drainage methods (such as basic plug with chain)! You can switch between the two modes, plug (water storage) and filter (water drainage), just by lightly pressing the top cover. Build in Strainer: Unlike regular puch button drain,this drain stopper has a anti-clogging basket strainer inside that neatly collecting hairs and prevents the drain from clogging. No jewelry, rings, dirt and other things will enter the drain pipe. Water-proof: It is a thickened, barbed and silicone gasket , which requires no glue, and it is characterized by oxidation resistance. Sturdy Sink Stopper: It is an integrated seamless design. The rubber ring around this built-in basket keeps the stability, it will not tilt when you push the button. So you don"'"t have to worry about sealing and drainage. Tough Material: The pop-up sink drain pipe is made of thickened and stainless steel material, which is characterized by explosion-proof and crack-proof, durable, smooth and comfortable to the touch, rust-proof, corrosion-proof and discoloration-proof. Easy to Install: Anyone can install the pop-up drain fliter, because it has a simple structure and doesn"'"t need any tools. Just take out the old sink drain stopper and insert the bouncing core. Note: 1. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. 2. The measurement allowed error is +/- 1-3cm.