Standard size 3-1/2inches openingThe removable deep basket prevents debris from clogging drain pipe. With the sealing lid which can control the flow of water. Easy to clean.Premium-grade 304 stainless steel, against rust and corrosionEasy to install Easy to clean Easy to use304 stainless steel Strainer with Basket and CoverThe strainer assembly fits 3-1/2"drain opening, so it works for most of kitchen sink on the market. Removable stainless steel deep basket is a special design to catch the debris from the sink, so no garbage disposal is needed if this strainer assembly is used.