PRECISION Knife Honer – battery powered portable electric honer extends time between chipper knife sharpenings. Portable device to hone chipper knives without removing them from the chipper. Properly used, this machine will substantially increase the sharpening intervals, as much as 4 times longer runtime between each knife change. Hone times as short as 3 minutes versus 30 minute minimum knife change. Less down time and less knife sharpening means more money in your pocket. Great time saving tool!