• Round rod size: Diameter 5 mm, length 150 mm, diameter precision +/-0.008 mm, hardness HRC61-63. • Wide applications: Used for machining chisels, augers, turning tools, milling cutters, shafts, piercing needles, and center pins. Suitable for processing upper circles, end faces, holes, planes, steps, and slots in copper, aluminum, and non-hardened steel. • Ease of use: Steel bars easy to cut and shape, smooth surface, easy to mold, no crack formation. • High-speed steel: High hardness, high strength, good toughness, wear resistance. Hot hardness is the main feature of high-speed steel. • Helpful tips: Deformation from strain does not affect its use. Not recommended for environments requiring high coaxiality. Avoid contact with air to prevent oxidation. Add anti-rust oil when storing.