The Dremel 4300 is the first Dremel rotary tool to allow tool-less and collet-less accessory changes with the inclusion of the three-jaw chuck. The chuck accepts all Dremel accessory shank sizes for fast and convenient accessory changes without ever using a wrench. Experiencing the full range of Dremel rotary tool applications is easier than ever because the 4300 offers our most powerful motor with built-in variable speed and electronic feedback circuitry. And the slim, ergonomic body design provides a comfortable 360-degree grip zone no matter how you hold it for extended ease of use. The completely redesigned airflow system lets the Dremel 4300 run cool, quiet, and smooth so completing projects are more enjoyable than ever.