The Dremel 4000 variable speed rotary tool offers the highest performance and most versatility of all Dremel rotary tools. The increased strength of its motor plus electronic feedback circuitry enables consistent performance at all speed levels. Dremel 4000 can use all existing Dremel accessories and attachments plus high-performance attachments to complete the widest range of projects. A slim, ergonomic body provides a 360° grip zone for comfort and control in any grip position. Tight spots, nooks, and corners they're all easily within reach when you add the 225 Flex Shaft attachment to a Dremel Rotary Tool. The Dremel Flex Shaft features a flexible 36 in. cable with a 5 in. bend radius, allowing you to comfortably reach your work in a variety of angles. The ergonomic comfort grip hand-piece reduces fatigue and allows for fingertip control to cut, grind, sand, sharpen, polish and more. The Quick Connect system makes it easy to attach to your compatible Dremel rotary tool.