Rotary rock tumblers work by rotating a barrel that contains rocks, water, and abrasive grit.

The rotating motion causes the rocks to tumble against each other, smoothing and polishing them over time. These tumblers come in a range of sizes and capacities, making them suitable for tumbling a variety of rock sizes and types. Additionally, rotary rock tumblers are often easy to use and come with everything you need to get started, including grit and other supplies.