The Medium Blue marine 5-inch power scrubber brush is the perfect cleaning tool for watercraft hulls of all kinds. The hull’s ability to smoothly cut through the water is dependent on a clean, smooth surface. Drillbrush was established in 2007. Our brushes are professional quality and have been tested and approved by commercial cleaners, marinas, detail shops, and other cleaning professionals. All Drillbrush Products have a 90 Money back guarantee.