Features EZ Change system to allow for fast, easy, tool-free accessory changes (no collet lock or wrench needed). Highest performing Dremel rotary motor is designed for maximum performance at all speed levels. Variable speed, 5000 to 35,000 rpm (revolutions per minute), for greater versatility and precise tool control. Cooler running with 20% more venting for increased power and airflow. Electronic feedback auto adjusts power and speed as needed. Slim, ergonomic body provides 360 degree grip zone for comfort and control in any position. Replaceable brushes for longer lifetime. Can be used with all Dremel accessories and attachments. Kit includes carry case, 6 attachments, and 40 accessories.