PREMIUM MATERIALS: The cover features A-class brass and multilayer chrome finish, efficiently resistant to scratches, corrosion and rust. Durable and high-quality silica gel help to store water well and prevent water leakage. SIZE: The diameter (sink plug plate) / 61mm/2.4inch, the inner and outer diameters of the diameter (rubber sealing ring) are 33mm/1.29inch and 39mm/1.53inch, the diameter (fastening bolt) / 16mm/0.62inch, the shut height of the plug screw is 10mm/0.39inch, The diameter of the middle pop-up plug is 30mm/1.18inch TWO MODE SWITCH: Improved extra stable compression spring is made of pure brass with good rebound resistance. Just press the top cap down gently to switch 2 modes stopper (to keep water) and strainer (to drain off water) EASY INSTALLATION: Anyone can install a pop up drain due to its simple construction,no tools required, this sink drain has an anti-clogging basket strainer inside that neatly collecting hairs and prevents the drain from clogging up Easy to Clean: All components can be easily removed for easy cleaning. Suitable for washbasin, sink and kitchen bathroom, The drain stopper is suitable for sink with hole in 33mm/1.29inch-39mm/1.53inch. Please insure the hole size before purchase.