We sell as wide variety of sink drains to work with almost any sink size. Sink drain openings are commonly 3-4 inches in diameter and then narrow to 1-1/2 inches in diameter. Sink drains can be found in a variety of finishes and can include stoppers and/or strainers, depending on what you application calls for. Remote access sink drains are also available, which allow for someone to open and close a drain from the deck of sink. We sell sink drains from all the main brands such as Kohler, Moen, American Standard and Elkay.