Practical for the price. Tested on an old knife and works properly, it is sharpened very correctly without more. Will fix well outside. Watch out for the opening of the diamond tip, because it is quite difficult and if you go too abruptly, it must be easy enough to break it. Since it seems to me to be intended for nomadic use, the hull of this sharpener would deserve to be aluminum for more strength, even if it increases the price a little.