Features Specifications: Including 5pcs rotary burr bits, with 6mm head, 10mm tip outer diameter and 25mm tip length, standard size, easy to install and replace. Tungsten Steel: The rotary burr set is made of excellent tungsten steel material, wear resistance, good processing quality, high finish, reduce labor strength, no clogging. For Engraving: These rotary file bits have fast cutting and high hardness, suitable for engraving wood, aluminum and plastic, efficient and durable. For Metal Polishing: This rotary burr bits can be used for notch processing and surface polishing of narrow and deep metal materials such as copper, iron, aluminum, alloy, etc. High Hardness: These tungsten steel rotary files have machining hardness of up to HRC70, and can replace the petiole wheel in most jobs, safe and reliable. Specification: Item Type: Rotary Burr Bits Material: Tungsten Steel Usage: Suitable for wood carving, root carving, olive pit, incisive blade Tip Outer Diameter: Approx. 10mm / 0.4in Tip Length: Approx. 25mm / 1in Package List: 5 x Rotary Burr Bits Package List 5 x Rotary Burr Bits