Constructed from top-quality Vanadium steel, these engraving bits exceptional durability and precision. perfect for detailed work, the burs range from 0.5 to 4 mm in size(0.5/0.6/0.8/1.0/1.2/1.4/1.6/1.8/2.0/2.3/3.0/4.0mm), accommodating carving needs for and hobbyists alike. Designed to fit seamlessly with any 3/32 inch (2.35 mm) shank rotary tools, these versatile burs are perfect for electric drills, grinders, and more. They provide the convenience and flexibility needed for intricate engraving and carving tasks. Perfect for a wide range of materials including silver, jewelry, wood, and walnut, these burs are perfect for craftsmen and artists. Whether you're a professional jeweler or a woodworking enthusiast, find these tools indispensable for your projects. Highly recommended for engraving delicate items such as olive cores, beads, , wood, and bone, as well as precious soft metals. These burs are specially crafted to handle fine details without damaging the fragile materials. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Silver Material:steel Size:0.5/0.6/0.8/1.0/1.2/1.4/1.6/1.8/2.0/2.3/3.0/4.0mm Package Contents: 12 * Round Shape Ball Burr Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.