Feature: 1. Made of high‑quality tungsten steel carbide, strong and durable. Used for wood, iron, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, marble, stone, bones, etc 2. High speed plus double cutting equals smoothness, used as mold grinder drill or metal engraving drill. Save a lot of time 3. All burr 1/8" handles are compatible with for Dremel or most rotating tools, and are precisely determined 4. 10 different shapes, suitable for woodworking, engraving, engraving and polishing various fine works 5. The tungsten carbide burr engraving bit is easy to use and reliable. The durability is ten times higher than that of high‑speed steel tools and more than 200 times higher than that of small grinding wheels Specification: Item Type: Rotary File Material: Tungsten Steel Purpose: Grinding Head Type: Single Pattern/Double Pattern (Optional) Tool Handle Diameter: Approx. 3mm / 0.1in Head Diameter: Approx. 6mm / 0.2in. Package List: 1 x Rotary File Note: Please allow 0‑2 cm error due to manual measurement. Thanks for your understanding