The Barcor Chamfer Gage is a precision instrument designed specifically to measure the top (major) diameter of a chamfer, countersink or tapered hole. Simply press the spring loaded, precision ground, 3-blade Gaging Plunger into the chamfer or countersink and instantly read the dial in .001" or .01mm/.02mm diameter increments. The Chamfer Gage is a direct reading gage. There is no setting master or chart required. To "Zero" the gage or check the setting, press the base of the gage against any flat ground surface and adjust the dial to read the number stamped on the back of the indicator. The Barcor Chamfer Gage is available in two angular ranges: 0°-90° for angles of 90° or less, and 90° - 127° for angles greater than 90° but less than 127° Models for angles larger than 127° upon request. Digital Gauges also available in 2-3" & 3-4"