This 4 piece variety drill brush kit is perfect for a buyer who has a variety of cleaning applications and wants a kit that can clean almost anything. The red stiff brush allows you to clean concrete and stone or any other heavy duty cleaning application. The yellow drill brush attachment is perfect for kitchen or bathroom cleaning. The Original Drillbrush corner brush allows you to get into tough to reach corners. The white soft 2 In. brush is perfect for use on upholstery and leather. We recommend testing any Drillbrush on a small area first before using it on the entire surface. All of the brushes feature a quarter inch quick change shaft that will allow them to work with your cordless drill or impact driver (drill not included).