Features High processing quality and high finish for precision mold cavities Applied to power drills, air tools, and die grinders Suitable for grinding, polishing, carving and polishing wood surfaces Fits 1/8-inch shank drills, compatible with electric and cordless drills 10 times more durable than high-speed steel cutting tools Feature: 1. High processing quality and high finish, and can produce various high‑precision mold cavities. 2. The rotary burr is applied to heavy duty rotary lapper sleeve to power drills, air tools and die grinders. 3. Before using the product, you need to grind, polish, carve and polish wood surfaces. 4. Most commonly applicable to 1/8‑inch shank, suitable for all electric and cordless drills. 5. Long service life, 10 times more durable than high‑speed steel cutting tool and 200 times more durable than small grinding wheel. Specification: Condition: 100% Brand New Item Type: Rotary Burr Material: Carbon Steel Color: Black Specification Shape: Ball, Oval, Cylinder, Large and Small Cone Stem Diameter: Approx. 6.1mm/0.24in Package List: 10 x Electric Black File Grinding Head Note: This carpentry rotation file is only for cork and other soft materials, cannot be used for hardwood carving and grinding. Package List 10 x Electric Black File Grinding Head