1、Nut and Bolt Measurement Tool Set: The nut and bolt inspection tool set includes 26pcs male and female nut and bolt size checker for measuring thread. Use detachable nut and bolt gauges to inspect, identify, and verify nut and bolt specification. 2、Standard Scale: Nut and bolt thread size measuring tool kits include imperial and metric thread checkers. A complete set of nut and bolt gauge size measurement tools suitable for janitors, repairmen, automotive mechanics, and mechanics. 3、For Measurement in Narrow Spaces: Each bolt and nut identifier in the kit can be disassembled and used to measure pitch in narrow or enclosed spaces. 4、With A Storage Box: The specification sorting box has clear nut and bolt markings, which can quickly and easily identify nuts and bolts. The foam firmly fixes the tool in place for easy sorting. The red gauge is in metric system, and the blue gauge is in British system. 5、26Pcs Nut and Bolt Thread Checkers: These are the most commonly used sizes in daily use, which can help you quickly organize various nuts and bolts, and make them neatly placed in the compartment box, avoiding misplacement and loss.