The Tru-Grind Stem sharpener is uniquely designed to hold flat scrapers and circular cup cutters up to 25mm for sharpening. It is designed to be used with the Woodcut Tru-Grind and other similar sharpening systems. In addition, it can be held in the jaws of a lathe chuck or cordless drill chuck. Easy to use, it only requires minimal pressure to completely restore an edge.-bg