The Superior Tool DrainKey™ Tub Drain Remover features an expanding design that allows The Drain Key to internally grip in a 360° pattern. Expands with a crescent wrench to unlock or install: Bathtub Drains, 1-¼" or 1-½" closet spuds, duplex strainers, jr. duo strainers, jr. basket strainers and tray plug drains. A professional tool that expands inside the drain with 3 knurled steel ‘shoes,’ then turns the drain out using the large nut.