Starrett Countersink Gages are offered in three different angles so that the gage sets on the angular side of the countersink, as opposed to a chamfer gage which sets on the top edge of the chamfer. FEATURES  Ground surfaces are of hardened tool steel  Indicators AGD design  100 Deg Angle  Directly reads the large diameter of the countersink  Includes set master ring  Includes set master ring  SPECIFICATIONS  Made in America: Yes  Type: Countersink Gage  Range (in): .020 - .170  Graduations (in): .002"  Dial Reading: For 100 Degree Countersinks