Everyone has experienced the problems caused by using dull knives. The all-new VSharp A4 is your solution. It uses two high quality, 325 grit diamond hones that sharpen both sides of the blade simultaneously. The A4 uses the patented V-Sharp system with angle settings of 15-,20-,25- and 30-degrees to sharpen virtually any knife. It is the perfect diamond knife sharpener for home use, chefs, fishermen, and hunters. Use with ceramic hones to sharpen serrated blades with ease! The A4 knife sharpener is easy to use, fast, and accurate. Using Warthog Sharpeners, almost anyone can sharpen a dull knife.