The Hum-B B3000 contains a three-head counter-rotating planetary drive system available with a 120 V single speed or 240 V variable speed motor. The system, combined with diamond abrasives, provides an aggressive flat grind for removing surface materials and preparing and polishing concrete and stone surfaces. This lightweight machine's drivers can easily be changed from grinding abrasives to carbide scrapers to cleaning brushes. CDC Larue Industries Inc. 866-954-9700.