Size: Our tub stopper fits an opening of 40-44mm in diameter. If you find it is the wrong size for the hole, feel free to send it back. And if there is anything else wrong, please feel free to contact us and we will always be here to provide you with satisfactory service. There is a protective film on the surface of the product, please remove it before use. Safe and Harmless: This easy-grip sink stopper is rust-proof and corrosion-resistant, it also can prevent clogging of hair or foreign matter. High Quality: The bathtub drain stopper is made of stainless steel and silicone material, well made, sturdy and durable, and can achieve a perfect seal. Easy to use: if you need to keep water in the sink, use the bathtub drain stopper to block the drain pipe, when you need to empty the tub. sink, just pull it out. Widely Used: Universal sink stopper is suitable for bathroom and kitchen sinks, sloped sinks, bathtubs, laundry room, swimming pool , etc.