100 Straight Choke and Barrel Micrometer 4 Gauge Compact Set

The 100 Straight Choke and Barrel Micrometer 4 Gauge Compact Set measures choke, bore diameter, chamber and forcing cone dimensions. Accurate to .001". Comes packaged in a solid oak case with solid brass hardware. The compact set includes four gauges, 12, 20, 28 and .410. Comes with instructions and extensive information for American and foreign guns.