Wire Thickness Gauge, Dimension Type Inch/AWG, Gauge Standard AWG, Maximum Measurement - Inch 0.3250 in, Maximum Measurement - Gauge #0, Minimum Measurement - Inch 0.005 in, Minimum Measurement - Gauge #36, Inside Hole Diameter 1 in, Material Steel, Outside Diameter 3 1/4 in, Range - Inch 0.005 in to 0.325 in, Range - Gauge #36 to #0