Kutzall Original Flame Burr, 1/4" Shaft (6.3mm) - Coarse, Abrasive Tungsten Carbide Coating: 3/4" (19mm) Head Diameter x 1-3/8" (34.9mm) Head Length - FL-34 Rapid Material Removal - Saving you time and effort. Tungsten Carbide Teeth - Giving you outstanding wear-life, for a much longer lasting burr. Comfortable, Effortless Operation - Allowing you to easily and quickly remove a variety of materials. Leaves a relatively smooth finish. Should only be used on non-metals or non-metallic materials.