The axe knife tool is part of their Viking Tool Series.
The patented tool includes an integral, easy to use gauge that ensures proper cutting angles are maintained. The tool is double sided and easily flipped for a brand-new cutting edge when the first side is completely worn. This doubles the tool life, in comparison to other knife tools. The thicker blade creates a more durable edge, increasing the overall life of the knife; the angle is also easier to sharpen. Ribs behind the knife’s edge lend to increased strength and durability. The tapered tool body allows chip material to flow efficiently with an optimal attack angle. Source