Specifications: Diameter: 3mm / 0.12", diameter accuracy: +/-0.008mm / 0.0003"; length: 100mm / 3.93". High-speed steel rod is with combination of hardness and toughness for wear resistance, hardness HRC61~63 General Purpose: Widely used for processsing milling cutters, sharp knives, gravers, punch press needles, bearings sleeve rods of machine tools, high hard ejector rods and mold center pins Versatile Steel Rods: Suitable for processing top circle, end face, bore, thread, plane, step, groove. Suitable for copper, aluminum, unhardened steel items Use Note: Please add some oil during storage and reduce contact with air or do not expose to air for rust protection. The surface is smooth, easy to shape, no cracks formed Meet Your Needs: Steel Rods can be easy to cut and formed into replacement parts for almost anything. You can cut to any size you want according to your needs Features: Diameter: 3mm / 0.12" Length: 100mm / 3.94" Color: Gray Material: HSS (High Speed Steel) HRC: 61-63 Package Content: 10 Pcs x HSS Lathe Round Rods s: 1. Widely used in Gear shaft, motor shaft, short support shaft, shaft pocket model, miniature axle. Rods can be cut and formed into replacement parts for almost anything. 2. The surface is smooth, easy to shape, no cracks formed. For DIY craft making. Sturdy and durable. Round Rods are nice and easy to cut. You can cut to any size you want according to your needs.