Sheet Metal Thickness Gauge, Dimension Type Inch/US Sheet Metal, Gauge Standard US Sheet Metal, Maximum Measurement - Inch 0.3120 in, Maximum Measurement - Gauge #0, Minimum Measurement - Inch 0.012 in, Minimum Measurement - Gauge #30, Thickness 0.125 in, Material Steel, Outside Diameter 3 1/4 in, Range - Inch 0.012 in to 0.312 in, Range - Gauge #30 to #0