1. Stone Grinding Kit Polish Your Gemstones: Stone grinding is an extremely popular hobby for both children and adults! This professional stone grinder is fun and easy to use to transform raw stones into beautifully polished gemstones thanks to its user-friendly and durable design. The stone grinding kit makes grinding even easier in an interesting way to transform any raw stone and polish it into super shiny and beautiful gemstones. Timer function: The durable motor has a time control setting, so you can configure it and not worry if you forget it. 7-day digital timer (with automatic shut-off function), you can set and repeat it according to your needs, while you want to have your own beautiful gemstone, which requires a lot of time to grind and polish, so it takes time and patience. Size: 21 x 14.5 x 16.6 cm. 2. Have fun with DIY: Children can collect different stones outdoors and turn them into beautiful and attractive stones. During the operation, children can experience the joy of work, enjoy the feeling of achievement and promote their curiosity and observation. Detailed instructions in the glass guide will guide you step by step through the tumbling process, including fascinating facts about the gemstones in the kit. 3. FUN GIFTS FOR ALL AGES: Stone grinding is not only a rocky glass for children, but also a rocky glass for adults, making it a fun and high-quality craft tool for children and families. Definitely the perfect gift for Christmas, Children's Day. A stone grinder can improve children's interest in geography and science and train children's patience. Easy to use: The stone grinding kit is easy to use and very suitable for beginners, and the instructions in the educational toy set provide detailed instructions on the operation process for raw stone grinding. Package: 1 x stone grinder, 1 x raw stone (in the roller), 4 types x (coarse grinding, fine grinding, polishing, final polishing) polishing powder, 2 x ring rings, 1 x necklace + gemstone holder, 1 x keychain, 1 x leather strap (replacement), 1 x power cable with Euro plug, 1 x English instructions.