Smith's 2-Step Knife Sharpener features pre-set tungsten carbide cutting heads and fine ceramic rods. This sharpener comes with two sets of non-slip rubber feet for added safety. It is lightweight, portable, and easy to use. Excellent for use on all types of straight-edged knives. Coarse/Carbide - Pre-set Tungsten Carbide cutting blades provide quick edge setting capabilities and are excellent for use on very dull knives or knives that have a damaged edge. Three or four strokes is all it takes. Fine/Ceramic - Two Pre-set Fine Ceramic rods provide a smooth finished edge on already sharp knives.