The Swhacker HDX3 sharpener can handle your razor blades, broadheads, fillet knives, kitchen knives, butcher knives, hatchets, machetes or just about anything else with an edge! Useful for Cooks, Hunters, Fishermen, Campers, Fire & Rescue, Police, Military & Construction. The HDX3 can be carried in wallets, pockets and on key rings. The HDX3 can also be bench mounted. To use: place blade in bits at 45 to 60 degree angle, apply medium to light pressure while drawing knife through bits. Slowly ease off pressure and finish feather light. Only a few strokes are needed to sharpen most blades.