"Our sink drain stopper fits 99% US standard sink drain 1 1/8 inch to 1 1/2 inch. Please be sure to measure the sink drain hole before purchase. It is recommended to be used on drain hole diameter between 1.1""-1.5"". Sink stopper or strainer? You need it all. Unlike other regular drain plugs, this innovative design cleverly combines 2 features water-seal and anti-clogging in Pop-up cap and anti-clogging frame made of integral molding brass with shiny chrome finish, bullet core made of premium brass, equipped with 3 silicon seal-rings in 3 different positions. It's anti-rust, reliable, and durable. No need for hundreds on costly plumber bills, no need for troublesome tools on unclogging pipes, no need for worry about drain cleaners' pollution to the environment."