Brand New Turfscrub Single-Sided Coarse Bristle Brush Type Floor Pads (4 Pack), 20" 20-Inch, 4 per pack, made in USA Ideal for cleaning deep grout lines and uneven Floor surfaces No need for expensive brushes and easy to change Recommended for use on machines up to 500 RPM For best results use in standard electric, Automatic scrubber and Oscillating machines