The Dremel 8240 offers high performance and versatility, packaged in a sleek new tool design. As the new flagship 12-Volt cordless rotary tool, the 8240 features an optimized battery platform allowing DIYers to comfortably tackle a wide range of home improvement projects without the distraction of a cord. The powerful 12-Volt/2 AH Lithium-Ion battery provides maximum performance for extended working sessions. The new 8240 provides cord-like power in cordless form giving you the confidence to tackle the toughest of jobs. 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 & bristle brushes, cut-off wheels, and more. Can be used with Dremel 225 Flex Shaft and the 575 Right Angle attachment.