Stiff nylon bristle drill brush fits cordless drill for heavy duty scrubbing. Works great on Brick, Stone, and Concrete. This brush is more aggressive than our medium stiffness brushes.Cordless drill NOT included Drill NOT included. -Stiff red bristle Drillbrush for heavy duty cleaning applications -Restore concrete statues, gargoyles, and birdbaths. Return monuments and granite headstones to their original beauty. -Stiff bristles for heavy duty scrubbing. Used to clean pool tile, decking, concrete, stone, anti skid boat surfaces. -Not recommended for carpet or upholstery (see our line of White soft bristle brushes) -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.