The Lyman Universal Trimmer Power Pack Combo is the ideal combination of Lyman's Universal Trimmer and a power adapter, which quickly and easily converts your hand-operated trimmer into a power trimmer. All you need is a power screwdriver or an electric drill. Not only does the Lyman Universal Trimmer Power Pack Combo make power trimming easier than ever, but it has the capacity to trim more than 250 cases per hour. The adapter shaft includes a super-sharp cutter as well as stop collars, so you are able to switch back and forth between hand trimming and power trimming without having to change settings.