17" "EXTREME MACHINE" BUFFERThe Extreme Machine is ideal for grinding, sanding, mastic removal, concrete profiling and more! This rugged buffer shrugs off the abuse of grinding, scarifying and sanding concrete. In fact, the use of Scrape Aways, EZ Strip, or other grinding attachments will not void the warranty, unlike other popular buffers. The Extreme Machine features a triple planetary gear unit with a steel coupling. Thats why it has a 1 year warranty on parts and labor even