1-1/8 in. X 1 in. 12, 000-Series Annular CutterMfr #: 12136 Hougen has been making 12,000 Series Annular Cutters since we invented them in 1974. At one time, our president was putting the tooth geometry on every Hougen cutter in the world. Two flats for cutter mounting, O. D. Margins, I. D. Margins, fully fluted tools, patented tooth geometries, material types, coatings, and resharpenability. Hougen cutters with the Hougen Edge, feature a patented tooth geometry that provides long tool life, less