Quality Material: Spherical Rotary burr made of premium carbon steel material, wear resistance and high hardness, premium to use, and suitable for machining various kinds of metal materialsSphere Rotary Burr: Ball Gouge Grinding Head, provides you with wear life and longer lasting burrs. Shape, contouring, hollow, notch, trimming, or make adjustments with easeEasy to Use: This is an essential bit for metalworkers & DIY carving fans, easy to grasp and use, safe, and reliable, and effortless operation allows you to remove various materials easilyPower Carving Tool: Rotary Grinding Head, Lightweight and portable, easy to carry and use. Great for DIY woodworking, carving, grinding, polishing, engraving of wood, rubber surfaces, etcWide Applications: Ball Gouge Angle Grinder Attachments for metalwork, tool making, engineering, model engineering, welding, chamfering, casting, deburring, grinding, sculpting, etc Specification: Material: Carbon SteelProduct Size: 10.8cmx4cmx2.5cm/4.25inchx1.57inchx0.98inch Package Includes: 1Sphere Rotary Burr Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.