Foredom Carbide Miniature Inverted Cone, 2.35 mm Dia. 1.6 mm Long, 2.35 mm Shank. 1 3/4 Inches Overall Length, Style A-240. 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.