This 20" brush is designed to fit on the Powr-Flite® Phantom 20" auto scrubber. The brush is made of soft, polypropylene bristles that work well for everyday scrubbing. Brushes outlast pads 100 to 1 and work better than pads on surfaces that are uneven like tile with grout and unfinished concrete and stone. Can be used on smooth or rough floors. Remove even heavier soils when paired with floor cleaning degreasers. If this isn't the right brush for your machine, check out all the options we have to offer in the auto scrubber brushes category.