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 0.007 in Minimum Measurement - Gauge #36 Inside Hole Diameter 1 in Material Steel Outside Diameter 3 1/4 in Range - Inch 0.007 in to 0.312 in Range - Gauge #36 to #0