This product is made by abrading a high-quality natural diamond of certain weight to a high-tech required standard geometrical shape. Its type covers Rockwell, Vicders and standard. It is used in the standerd sclerometer of metric department and the judge of material hardness. Detail: Product ID:Natural Diamond Punch Type:RC-3 Angle:a=120?15' R0.2?.01MM Indicated value: HRC Above: +0.1 Mid: 0 Under:-0.1 Length: 25MM With: Each production??ndicated value?s different