The 8" 600-grit Honing Cone tapers from 3/4"dia. to 1-1/4"dia. It is perfect for cleaning up the burr left inside the flute of gouges after grinding. The honing cone is coated with monocrystalline diamonds to ensure the diamonds won't fracture, providing longer cutting life. This DMT Honing Cone can be used dry or with water as a cutting lubricant.