Starrett® Countersink Gage, Series: 688, 0.16 to 0.36 in, Graduations: 0.002 in, 1-43/64 in Dia Dial, White Dial, Hardened Tool Steel.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. Starrett® 688-2Z Countersink Gage with Case, 0.16 to 0.36 in Measuring, Graduations 0.002 in, 1-43/64 in dia dial, Hardened Tool Steel