HHIP convex cutter is made of high speed steel and it used for milling female half circle. Precision ground. Performance at lower cost. Better finish possible in many materials with profile ground. Number of teeth is 6. 3/4" Cutter Diameter. 1/16" Radius. 1/2" Shank Diameter. 3" Overall length. High speed steel used for general purpose matching of both ferrous and nonferrous materials.