At 109 pounds, this 20" Viper 175 RPM floor machine is the ultimate floor buffer. The heavy steel construction provides plenty of down force to buff out scuff marks from any commercial tile. This machine works great with a 20" red pad, and our floor buffing restorer. This will effectively remove all black scuffs from the surface of your floor. We then recommend following with a 20" white pad to polish that floor to a nice shine.