Foredom CeramCut Blue Stone, 8 Piece Set, 1/8 inch Shank, Style AKHK28. Kit includes: 10060, 10061, 10062, 10064, 10065, 10066, 10067 and 10068. These tools have a ceramic and aluminum oxide abrasive grain structure superior in performance and life to standard aluminum oxides or silicon carbides. Widely used on hard metals including hardened and mild steel, steel alloys, chrome, cobalt, titanium, platinum and other ferrous metals. Also suitable for porcelain materials and wood. CeramCut Blue Stones remove material faster, run cooler and last 3-5 times longer than other abrasives. Non-impregnating and non-contaminating. 45000 RPM Max Speed. Made in USA.