What is a rock tumbler? Quite simply, it's a machine that uses rotating drums to polish rocks. It's been around for centuries and has been used by many hobbyists as well as professional collectors. Rock tumbling can be done at home with the use of an expanded drum kit or people can take their project to someone who specializes in this craft. If you're looking for more … [Read more...] about Rock Tumbler: All You Need to Know About This Awesome Tool