The Dremel 4000 variable-speed rotary tool kit offers the highest performance and most versatility of all Dremel rotary tools. The increased strength of its motor and electronic feedback circuitry enables consistent performance at all speed levels. Ergonomics include a slim design that provides a 360-degree grip zone for added comfort and control. The Dremel 4000 can use all existing Dremel rotary tool accessories and attachments, as well as high-performance attachments, so you can do more with just one tool. Two year warranty.