High-grade- tungsten carbide inserts sharpen both sides of the blade at the same time. Restores knife edge in three or four strokes. To sharpen a pair of scissors- place the sharpener flat on its side- and with a few quick strokes- draw the scissors blade through the slot. Built-in finger guard helps to protect your hand. Lightweight- compact size for easy carrying and storage. Sharpens electrician™s scissors- pocket knives- retractable-blade utility knives- razor blade knives- and serrated knives.