Xcsource 5pcs Tungsten Carbide Rotary Cutting Burr Set Grinder Bit 1/4" (6mm) Shank 12mm Chamfering Carving Tools BI225 Carbide burrs extremely versatile, used in mold manufacturing. Mechanical parts chamfering, rounding and groove processing. Fit for Woodworking. Cleanup casting, forging, welding pieces of flash. Woodworking Metallic and non-metallic materials (bone, jade, stone) carving arts and crafts. Cutting edge diameter: 1/2 inch (12mm). Shank diameter: Approx 1/4 inch (6mm).