Nut and Bolt Measuring Tool Set: Our nut and bolt checker set includes assortment of 44 male/female nut and bolt size checker gauges for measuring thread pitch. Use the detachable nut and bolt gauges to check, identify & verify nut and bolt size.Standard SAE/Inch & Metric Sizing: The nut and bolt thread sizer kit includes both SAE and metric thread checkers. The all-in-one complete nut and bolt gauge sizing tool set for plumbers, handymen, repairsmen, auto mechanics & machinists worldwide.Supports Measuring in Tight Spaces: Unlike a wall mounted nut and bolt measurer or stationary nut and bolt board, each bolt and nut identifier gauge featured in our kit can be removed & used to measure thread pitch in cramped or enclosed spaces.Nut and Bolt Size Guide Storage Box: Featuring clear nut and bolt labels, our gauge organizer box makes nut and bolt identification quick & easy. Foam firmly holds gauges in place for organization. Red gauges are metric, blue gauges are inches.Nut Bolt Thread Checker Sizes Included: METRIC M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75, M14x1.5, M14x2.0, M16x1.5, M16x2.0, M20x1.5, M20x2.5, M24x2.0, M24x3.0. INCHES: 6-32, 6-40, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20, 9/16-12, 9/16-18, 5/8-11, 5/8-18, 3/4-10, 3/4-16, 1-8, 1-12