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.This brush kit is great for cleaning Barbecue Grills. This kit includes (3) brushes that all feature quarter inch quick change shafts for use with your own cordless drills. Nylon bristles are safe to ingest unlike competitors metal brushes. Stainless steel wire brushes can break off and get inside your food. Our nylon brush will clean more effectively as it uses all of the power of your cordless drill without the risk of contaminating your food with sharp metal wire. These brushes will not rust like metal bristle brushes. Do not use on warm surfaces.Cordless drill NOT included Drill NOT included