100% Swiss made. Recommended by FELCO for sharpening their complete line of pruners and loppers. The Swiss iStor Professional has a curved composite-steel tungsten blade, specially designed to eliminate to forming of shoulders on cutting edges. All you have to do is stroke the Swiss iStor along the blade to be sharpened several times, using a little pressure. Finish off with even lighter strokes to obtain a high quality, very smooth edge. HANDY HINT: colour the bevelled edge of the blade with a felt pen before sharpening so you can see where you have been. The Swiss iStor Professional also has a finger guard to ensure your fingers do not accidentally slip onto the sharpened blade and a hole for keyring attachment. Swiss iStor, the best knife sharpener in the world.