【Universal】This drain filter is designed for the universal bathroom sink drain. Considered the unsure of measurement, the drain stopper comes with 3 sizes of rubber rings. The ring screwed into the stopper is for the 1 1/4 " drain hole; If it doesn't work after installation, please try another size ring. 【Upgraded Edition】Compared with fixed size traditional sink drain stopper, the bullet core plug is suitable for 1.1 in.~1.5 in. (28mm~38mm) dia size hole. It's more convenient to drain water compared to the rubber stopper, cause it is no need to pull it out to drain, and then press it to seal. 【Build-in Strainer】This bathroom sink drain stopper has an anti-clogging basket filter inside that can prevent the sewer from stuck with hairs, rings, jewelry, dirt. 【Simple Installation】No need tool, just take out the old one and insert the strainer core to complete installation. The plug avoids the problem of having to replace the entire drainpipe when it is difficult to buy the correct size drain plug. It saves you the hassle of replacing the drainpipe. 【Premium Material】The drain plug is made of stainless steel and brass. Quickly seal and drain water with a single press. No worry of rust, cracking, corrosion or leakage. Perfect match with your sink.