Features: High quality ultra-fine particle and ultra hard tungsten steel bar. Good rigidity and high strength, strong wear resistance. It can process materials with hardness below 55. Used for tool grinding, can be grinded into cutting tools, such as cutter, milling cutter, bit cutter, etc. Widely used in tungsten steel mold, tools, such as punching needle. Specification: Material: Tungsten steel Color: Silver Shank form: round shank Diameter tolerance: 0.01mm Machining hardness: HRC45, HRC55 Model (Optional) Diameter Length Weight #01 3mm/0.12inch 100mm/3.9inch 11g/0.39oz #02 4mm/0.16inch 100mm/3.9inch 18g/0.63oz #03 5mm/0.20inch 100mm/3.9inch 28g/0.99oz #04 6mm/0.24inch 100mm/3.9inch 40g/1.41oz #06 8mm/0.31inch 100mm/3.9inch 111g/3.92oz #07 10mm/0.39inch 100mm/3.9inch 159g/5.61oz #08 12mm/0.47inch 100mm/3.9inch 18g/0.63oz Package List: 1 x Tungsten steel Rod Note: Please allow slight error due to manual measurement. Thanks for your understanding. 1、High quality ultra-fine particle and ultra hard tungsten steel bar. 2、Good rigidity and high strength, strong wear resistance. 3、It can process materials with hardness below 55. 4、Used for tool grinding, can be grinded into cutting tools, such as cutter, milling cutter, bit cutter, etc. 5、Widely used in tungsten steel mold, tools, such as punching needle.