Official Walther compact sharpener with 2 different cutting angles. Suitable for a wide range of plain blade knives including swiss army tools and knives hunting/outdoor knives kitchen knives. 2 different sharpening inserts: The coarse carbide inserts (dark notch) are for basic sharpening. The ceramic inserts (white notch) are fine edge for polishing the blade and restoring it to its original shine. Genuine Walther product.