Foredom Carbide Tree Radius, 1/4 inch Dia. 1/2 inch Long, 1/8 inch Shank. 2 1/32 Inches Overall Length Style A-TR-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.