Xcsource 20pcs Tungsten Carbide Rotary Cutting Burr Set Grinder Bit 1/8" (3mm) Shank 3mm Woodworking Carving Tools BI228 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: 1/8 inch (.mm). Shank diameter: Approx 1/8 inch (3mm).