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. Quickly and easily change accessories on a Dremel rotary tool without changing collets with the Dremel Keyless Chuck. The 4486 Keyless Chuck eliminates the need for a collet and wrench when changing accessories. The steel 3-jaw chuck can be used with all Dremel rotary tools and can be used with all bits with a 1/32 In. to 1/8 In. shank. Ideal for light-duty accessories including drill bits， sanding drums， polishing wheels， wire and bristle brushes， cut-off wheels and more. Can be used with Dremel 225 Flex Shaft and the 575 Right Angle attachment.

4000 quick collet locks for fast accessory changes

4000 cool-running ball bearing construction for smooth and quiet operation

4000 replaceable motor brushes extend tool life

4000 includes: 4 attachments， 34 assorted accessories and a carrying case

4486 now have tool-free accessory changes

4486: eliminate the collet and wrench when changing Dremel accessories

4486: accepts all accessory bits with 1/32 in. to 1/8 in. shanks， use with rotary tool models 4000， 400， 3000， 398， 395， 300， 285， 275， 200， 100， 8220， 8200， 800， 780， 770， 7700， 750， 8050

4486: also use with Dremel attachments 212， 225 and 575