Product Size: Our pop-up sink stopper is a universal product with a ball core. The inner diameter of the sink stopper filter is 33.5 mm. It is suitable for drain holes with a diameter of 34-40 mm (1.34-1.57 in). The sink stopper can be used in bathroom sinks, kitchen sinks, or shower/bathtub drains, etc. Note: Please measure the size of your drain hole before ordering. Easy to Install and Use: Plug and play. No tools required. There is no need to replace the entire drain assembly; simply remove the old drain core and insert the pop-up drain stopper to complete the installation. Furthermore, it is easy to drain and store water by gently pressing the top cover. Built-in Filter and Anti-Clogging: Compared to ordinary sink stoppers, this new sink stopper is designed with a removable anti-clogging filter basket that can prevent hair, jewelry, and dirt from getting stuck in the drain. It is more useful and efficient than a traditional sink plug. 2 Working Modes: This pop-up bathroom sink stopper has two working modes. Simply press the top cover to switch between the two modes: stopper (retain water) and filter (drain). Premium Materials - Stainless Steel: Our sink drain stopper is made of high-quality refined copper and stainless steel, making it sturdy, rust-free, and crack-resistant. Additionally, the non-slip rubber pad and rubber ring provide double protection, effectively preventing water leaks.