Built-In Filter Unlike A Regular Drain, This Drain Stopper Has An Anti-Clogging Basket Strainer Inside That Neatly Catches Hair And Prevents The Drain From Clogging So That Items Like Jewelry, Rings, Dirt, Etc. Do Not Get Down The Drain.Fits 3.4 Cm ~ 3.8 Cm Diameter Drains. Please Note That It Is Not Suitable For All Sizes Of Drains. This Bathroom Sink Stopper Is Only Suitable For Drain Holes With An Inner Diameter Of 3.4 ~ 3.8 Cm. Warm Tip: Don'T Buy If Your Bathroom'S Drain Diameter Is Less Than 3.4 Cm.Sturdy Basket Stopper Integrally Formed And Seamless, The Rubber Ring Around Our Built-In Basket Keeps Stability, It Doesn'T Tip Over When You Press The Button, So You Don'T Have To Worry About Sealing And Draining.High Quality And Strong Material The Pop-Up Sink Drain Is Made Of Anti-Explosion And Anti-Crack Thickened High Quality Stainless Steel Material, With Durability, Flat And Comfortable To Touch Surface, Can Resist Rust, Corrosion And Tarnish The Vessel Sink Drain Is With 1 Heavy Brass Nut And 2 Thickened Stepped Silicone Seals Fitted To Its Leakage Proof And Oxidation Resistance Ability.Easy To Install Drain Filter Just Take Out The Old One And Insert It To Complete Install. Anyone Can Do This. Thickened And Elongated Nut Allows Installation By Hand Without The Use Of Tools.