This kits brushes have super stiff and aggressive nylon bristles for the removal of stains on concrete, brick or stone. The large diameter brush is especially useful for larger de-scaling projects on metal surfaces or removal of loose paint. This brush has very stiff bristles and is NOT recommended for fabric, carpet, or where scratching could be an issue.Cordless drill NOT included. -1/4 inch quick change shafts fits most drills and drivers. -Ultra Stiff nylon bristles also will aggressively remove loose paint, rust and stubborn stains on concrete, stone, metal, and brick. -Great for cleaning stone, brick, and other tough surfaces. -Used for heavy duty industrial stripping and harsh scrubbing applications. -All Drillbrush Products have a 90 day no questions asked Money back Guarantee. If you are not completely satisfied with our product we will issue a full refund or ship out a replacement at the buyer's request. Cordless Drill NOT included.