A. Polish your own gemstones: Stone turning is a popular hobby for children and adults. This professional stone grinder is fun and easy to use, making it possible to turn rough stones into cut gemstones. It has a user - friendly and durable design, which can turn any rough stone and polish it into shiny and beautiful gemstones. Timer function: The durable motor has a timer setting. You can set it and don't need to worry if you forget. There is a 7 - day digital timer (with auto - off function). You can set it and repeat according to your needs until you get your own beautiful gemstone. It takes time and patience as grinding and polishing take a while. Size: 21 x 14.5 x 16.6 cm. B. Fun DIY: Children can collect various stones outdoors and turn them into attractive stones. During the operation, children can experience the joy of work, enjoy a sense of success, and promote curiosity and observation. Detailed instructions on the glass will guide you through the turning process step by step, including interesting facts about the gemstones in the set. C. Suitable for both children and adults, it is a fun craft tool for children and families. It is a good gift for Christmas and Children's Day. The stone mill can improve children's interest in geography and science and cultivate children's patience. D. Easy to use: The stone turning set is easy to use and is suitable for beginners. The educational game set includes detailed instructions on the process of grinding rough stone. E. Package: 1 x stone tumbler, 1 x green stone (in a roll), 4 kinds of (coarse grinding, fine grinding, polishing, final polishing) polishing powder, 2 x rings, 1 x necklace + gemstone holder, 1 x key chain, 1 x leather strap (replacement), 1 x power cord with Euro plug, 1 x English instructions. F. We provide 24/7 after - sales service based on the concept of customer service. No matter where you are and what problems you encounter, we will solve them for you as soon as possible to make your shopping experience worry - free.