CRL Diamond Whetstone

CRL's Diamond Whetstone is harder than cubic boron nitrate which is three times as hard as a normal file. For this reason it will sharpen your blades and srapers for years. It is made of monocrystalline diamonds which have a strong crystal structure that does not break apart with use. The diamonds are bonded to nickel and then bonded to steel. Conveniently color coded blue for "coarse" (about as coarse as a normal file) and red for "fine" (which will put a razor edge on what you are sharpening). It has a convenient handle that folds up around the tool to keep it clean when not in use. Measures 4 inches by 1 inch (102 by 25 millimeters).