Foredom Carbide Miniature Cross Cut Tree Radius, 3/32 inch Dia. 1/4 inch Long, 2.35 mm Shank. 1 1/2 Inches Overall Length, Style A-TR-5C. Miniature Carbide is ideal for use on hard wood and most metals including stainless steel, steel alloys, cast iron, etc. 100000 RPM Max Speed. Made in USA.