[Adjustable Speed] The rotary tool has 3 adjustable speed (5000, 10000, 18000RPM) The lowest speed let you polishing your nail in safe, the highest speed are also working on metal carving. [Portable & Easy to Operate] The precise grinding engraver is only 21.5 cm (8.46 inches) long, so you can put it in any of and clothing pockets. You can switch and adjust the speed with one key, there are 3 gears in total, the speed of 1-3 gears is 5000-10000-18000 Rpm/Min, you can choose according to your needs. [Wide Range of Applications] Cordless design overall compact, takes up no space and is easy to carry anywhere. perfect for professional engraver and carving beginners. [Low Noise] The sound of this cordless rotary tool is very low when working, even if someone is sleeping, he or she not feel very noisy. Great for beginners and professionals to use anytime, anywhere to make creations that you like [Various Grinding Bits] these metal engraving machine kit include 30pcs rotory bits,2 drill bits, 3 saw blades, 1 shank post, and 17 sanding and polishing tools,all these bits are enough to work on engraving, carving, sanding, polishing, , routing, grinding, drilling, cutting., Weight: 0.45856150496 Pounds, Manufacturer: Aisuoka