The corner brush is best for corners, door tracks, and tight spaces. Great for cleaning grout corners and tight places. The perfect all around cleaning brushes. This brush head is compatiable with the Spin Scubber. Includes: 1 x Corner Brush. The Spin Scrubber is not included. Works on: tile, grout, showers, tub and more! Includes 1 Replacement Head. Waterproof Brush Head! Universal