Comprehensive thread measurement: this 50piece nut and bolt thread gauge set accurately measures both SAE and metric thread sizes for a wide range of projects. Professionalgrade tool: designed for plumbers, maintenance workers, and engineers, it is a reliable addition for various applications in any workspace. Compact and portable: each gauge can be disassembled easily, allowing access to tight or confined spaces where other tools may struggle to fit. Organized storage solution: the included organizer box features clear labels and foam inserts to keep gauges securely in place, making identification and access quick and efficient during work. Use case: plumbing installations and repairs. use the gauges to determine the correct thread size for fittings, elbows, and adapters to ensure proper compatibility. Use case: machinery and equipment maintenance. verify thread sizes on fasteners, replacement bolts, and threaded components during servicing of machinery and equipment. Use case: prototyping and engineering. check and confirm thread dimensions during design, assembly, and testing of projects.