Grinding stone of silicon carbide for screwdriver blades

This silicon carbide stone is a stone that can be used for sharpening watchmakers screwdriver blades. Simply press one of the blades-side on the silicon carbide stone, and keep a gentle pressure on the blade as you pull it across the block. This will result in the sharpening of the screwdriver blade. Together with one piece very fine sandpaper, for the 2nd step, you achieve fantastic results and your watchmaker screwdriver can be used again.