Viper Venom VN20DS Dual Speed heavy duty Floor Buffer is a multipurpose designed to clean, strip or polish almost any floor surface. Other applications include: carpet bonnet cleaning or shampooing, and gym floor screening. Dual Speed Floor Buffer Scrubber Machine With Pad Holder 20 inch Viper Venom 20DS 1.5 HP 185 or 330 RPM, VN20DS.