Suitable for 2.5-3.5cm diameter 3-in-1 design The product itself comes with three different sized washers. Mainly made of stainless steel and brass, this drain plug is durable enough, rust-proof, explosion-proof, crack-proof, airtight, and not easy to rust. perfect seal Just press the stopper into the drain and the silicone ring creates a perfect airtight seal against water flow. Anti-clogging This bathroom sink drain has an anti-clogging basket inside that catches any hair in the bathroom and prevents the drain from becoming clogged with small objects like rings. Either a bathroom sink drain or a shower tub drain will do. step 1 Take off the old sink plug, it's mostly stainless steel and brass construction. It's durable enough to resist rust, cracks, and explosions. Step 2 Insert the new sink plug into the sink hole, no tools required, just remove the old plug and install. Perfect for sinks or tubs. Step 3 Press to test the pop-up sink plug, anyone can install a pop-up drain due to its simple construction. Perfect for your sink. the fourth step fully Start your easy life This bathroom sink plug has an anti-clogging basket inside to keep hair, jewelry, rings, dirt, etc. from getting stuck in the drain.