Allows 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. Featuring the all new Pivot Light, your projects are will lit with an optimum line of sight since the light pivots to direct illumination whereyou want it. Variable speed and electronic feedback circuitry. 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 air flow system lets the Dremel 4300 run cool, quiet and smooth so completing projects are more enjoyable than ever. 6' cord. Variable speed: 5,000 - 35,000 rpm.