PROFESSIONAL, INDUSTRIAL AND HOME USE FAST: Real diamond quality, the material harder known, reduces the time of the sharpness of the machine. Simple: apply the blade to the surface with little pressure. Long service life: the natural diamonds use a long service life. VERSATILE SHARPENER: Any kind of material: steel, glass, ceramic, tungsten carbide, etc. A unique manufacturing process guarantees a long service life. A base of perforated steel is incastrata within a base of plastic with a strong pressure. The steel discs are then embedded with natural diamond in a nickel plate. The cover of diamond ensures a quick grinding while the teeth of plastic keeps the water acting as a lubricant and distributes the diamonds away dust that during the process of sharpness. The diamond stones are available in four different degrees of hardness: D15 extra fine/green (9 microns, hardness 1200) D25 fine/red (25 micron), thickness 600) D46 coarse/blue (45 micron), hardness 325) D76 extra large/black (60 micron, hardness 220).