Designed to work with every shape, size and style of knife blade in your kitchen, the Rhineland Angle Pro is a sharpener like no other. It works on varios blade angles—from 21º to 13º. An included gauge takes the guesswork out of determining blade angle and once you know that, sharpening it a fine finish is easier than ever. The sharpening blades use a diamond edge to do their thing. Sized to fit & store easily in a standard kitchen drawer.