Drum and pail roller and tumbler mixers agitate contents within closed containers without having to insert mixing equipment or touch their contents. They eliminate the need to clean up after mixing and help prevent worker exposure to liquids and substances that are volatile, hazardous, or require sanitary conditions. Typical uses include factories and manufacturing facilities that thoroughly blend contents that are pure or settle over time, like paints, oils, chemicals, and syrups, before filling them into smaller containers. Drum tumblers, drum rollers, and pail rollers must be used with gated enclosures that have safety interlocks to comply with OSHA regulations.