This brush cleaning set has four different medium bristle brushes, including a 2-inch flat brush, 2-1/2-inch cone brush, 3-1/2-inch round brush, and 4-inch flat brush. Plus, it also comes with a 6-inch quick-change extension. The set works with most cordless drills and features durable, medium polypropylene bristles. It's suitable for cleaning bathroom surfaces, grout, upholstery, wheels, tile, showers, toilets, kitchens, bathtubs, carpet, and more.