The model 400 xpr innovative new Variable-Speed MultiPro Rotary Tool features a new design and top speed of 35,000 rpm. It offers more control and precision than ever before, thanks to a click-and-set on/off switch. Add to that a new comfort grip housing for easier handling, and you have got a versatile tool you will not want to put down. FEATURES Improved motor for more performance and precision than ever before. Ergonomic, contoured styling with soft-grip areas for greater comfort and control. Separate on/off switch and speed control dial for the perfect speed every time. Experience outstanding performance with new, exclusive XPR attachments, as well as other Dremel attachments and accessories. 5,000 - 35,000 rpm speed range; no other AC power tool is faster Convenient Collet Lock Button with lock-out feature for quick accessory changes. "Dove-Tail" feature for "NEW" Dremel attachments.