The REO198 Redi-Edge Original Knife Sharpener is great for virtually all knife sharpening needs both indoors and out. Ribbed housing provides for good grip-ability even when wet. Stick-type design is machined from military-grade aluminum bar stock for extreme durability, long life, and is lightweight. Great for keeping culinary, craft, work or other type knives sharp. The Duromite sharpening elements are harder than any knife blade and factory pre-set to sharpen most knife blades at a 40 degree inclusive angle to maintain a 20 degree double cutting edge. The Original Knife Sharpener comes with a ballistic black sheath.