With tough bristles, these cleaning brushes are great for concrete, brick, and other heavy duty cleaning applications. The Hex Shank allows these cleaning brushes to be compatible with the RYOBI 4-Volt Cordless Compact Scrubber (P4400), RYOBI Brush Handle, Drill/Drivers, and _ in. Impact Drivers. Check out the rest of the RYOBI Cleaning Line-up in select stores and online. RYOBI has your back for all of your cleaning needs!