The new Tormek Diamond Wheels offer exceptional durability plus the ability to sharpen on the side as well as the periphery. The new diamond wheels come in three different grades; Coarse, Fine, and Extra Fine. The quality of the diamond surface provides a high and constant sharpening ability and a grinding wheel that always remains full size in diameter. Users who frequently sharpen the same tool will benefit greatly from this feature as it simplifies both setting and sharpening. Diamond is the world's hardest material and almost twice as hard as cubic boron nitride (CBN), which is another commonly used abrasive. The diamond's extreme hardness and durability make it the optimal material for sharpening.