Drillbrush was established in 2007, we have been designing and innovating brushes based on feedback and demand from our valued customers. Our brushes are professional quality and have been tested and approved by commercial cleaners, marinas, detail shops, and others industry "hands on, daily user" reviewers to be the absolute best solution for a wide variety of cleaning and scrubbing tasks. Always look for the "Drillbrush Power Scrubber" logo to insure you are buying an authentic Drillbrush from the leader in drill powered cleaning brushes. The swimming pool and Spa scrub brush kit features our most popular power brush: The Original Drillbrush Power Scrubber multi-purpose and corner scrub brush (in blue). The Original is perfect for rounded corners in hot tubs, artificial ponds, and concrete pools A MINI version of the Original, and a 2 in. diameter, long bristle, brush are included to handle small details, crevices, and hard-to-reach areas. Use the round flat 4-inch and 5-inch brushes for larger surface areas on decks or vinyl pool liners. Rinse after use to remove chlorine All of the brushes in the swimming pool and spa scrub brush kit have rugged steel shafts and feature a quarter inch quick change end. This allows the brushes to fit in all cordless drills and impact drivers, and to be changed quickly to match your cleaning needs All Drillbrush Products have a 90 day no questions asked return window. 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