Practical and intelligent design of carving grinding pens: This engraving machine is easier to replace drill bits than other engraving machines. Without using any tools, simply insert the drill bit and remove it directly. In addition, its design has low noise and is easy to carry, without worrying about affecting family members during work. Perfect for beginners or professionals to use, easy to carry, and then customize and make your daily necessities, such as special gifts The adjustable speed of this carving pen: With the speed control button, it can reach up to 20000 RPM and adjust the speed according to your needs. There are three levels of adjustable speed, which can be adjusted for different materials within the range of 5000 to 20000 r/min. Press once, 5000-10000r/min. Press twice, 10000r-15000r/min. Press three times, 15000r-2000r/min. The lowest speed allows you to create jewelry and jade art works, as well as polish your nails in a safe environment. The highest speed allows you to work on wood, glass, and plastic carving. Suitable for various occasions: The multifunctional grinding and carving pen can work accurately and comfortably on almost any surface. It is very suitable for carving and grinding various materials, such as wood, stone, peach pits, eggs, handicrafts, glass, ceramics, plastics, nail polishing, sports goods, toys, mobile phone chargers, exquisite jewelry, and glassware. This grinding pen has many characteristics: it weighs 40 grams, is light in weight, and is easy to operate. Therefore, for beginners, it is easy to grip and use. Due to the main design of this carving pen, which has clamping stability and high concentricity, it is very stable during precise drilling and fine carving. There is also a large capacity 380MAH battery, allowing you to work longer and provide long-lasting power. Rechargeable intelligent power outage: Our metal carving tools are rechargeable and equipped with USB cables. The mini miniature engraving pen is equipped with a built-in safety protection circuit board and an intelligent overload protection chip. When the working resistance is too high, it will automatically cut off the power to prevent damage to the carving pen. Please rest assured and use it safely. Color: silver material: metal Package Contents: 1 x engraving pen 1 x usb cable 2 x grinding head 30 x bits