Foredom Carbide Cone 1/4 inch Dia. 1/2 inch Long 1/8 inch Shank 2 3/16 Inches Overall Length Style A-CO-3. Carbide bur with standard flutes are used for easy material removal and leave a smooth finish. These burs are ideal for use on hard wood and most metals including stainless steel steel alloys cast iron etc. 35000 RPM Max Speed. Made in USA.