This three piece power brush kit contains an Original Drillbrush Power Scrubber in Stiff bristle Red and Black for all around scrubbing and cleaning, a 2 inch and a 4 inch round, flat Red aggressive scrub brush. The 2 inch brush is perfect for tight areas and corners. The 4 inch brush is for larger surfaces but are still easily maneuvered around contours. Quarter inch steel QUICK CHANGE stainless steel shaft fits in most cordless drills and drivers. Durable construction, not available in retail stores. See our other Amazon Drillbrush listings to purchase these brushes separately and see our great customer reviews. We also carry the largest line of drill powered brushes available for many applications.Cordless drill NOT included Drill NOT included. -Brushes are made with stiff bristle fiber and our securely attached to the block. -All three brushes have quarter inch steel QUICK CHANGE shafts. -Works great on concrete, brick, fireplace, stone, sidewalks and driveways. -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.