Bolt & Nut Gauge, Measures: SAE #4 to #10, 1/4 in. to 1 in., & 3 mm to 22 mm Bolt Sizes, SAE #6 to #10 & 5/16 in. to 5/8 in. Nut Sizes, Dimensions: 8 5/8 in. x 3 1/4 in., Includes:, Standard & Metric Rulers & Thread Gauge|JEGS Bolt & Nut Gauge [Standard and Metric].