Variable speed from 5000 to 30,000 rpm (revolutions per minute). Tool's variable speed control sets the speed to match a particular accessory and is designed to be used with all Dremel accessories and most threaded attachments. High capacity 8V lithium-ion battery for longer run times. Lithium-ion battery maintains charge up to 2 years while in storage. Comfort grip housing for easier handling and better tool control. Kit includes 21 Dremel accessories to complete a variety of projects: 401 mandrel, 402 mandrel, 403 bristle brush, 407 1/2 In. (inch) drum sander, (2) 414 felt polishing wheels, 421 polishing compound, (2) 445 1/2 In. 240 grit sanding bands, (3) 408 1/2 In. 60 grit sanding bands, (3) 432 1/2 In. 120 grit sanding bands, (3) 540 1-1/4 In. cut-off wheels, 84922 silicon carbide grinding stone, 932 aluminum oxide grinding stone, 952 aluminum oxide grinding stone, wrench.