Description: Standard and Metric Thread : The thread can quickly identify 28 different sizes of bolts and nuts. Metric thread sizes range from M4x0.7 to M14x2.0, and standard thread sizes range from 6-32 coarse to 1/2-20 fine.Premium Material: Nut and bolt thread checker is made of quality aluminum alloy material, with a sturdy structure, not easy to break, and can be used for a long time.Well Made: The bolt size and thread gauge scale line reading is clear, the measurement is convenient, and the reading is accurate.Portable: Bolt and nut identifier gauge has reserved mounting holes, which can be easily mounted on the wall or put into the tool box, making it easy to carry to different workplaces.Wide Application: Nut and bolt thread checker is suitable for auto mechanics, plumbers, mechanical engineers, and DIY tool enthusiasts. Specification: Material: Aluminum AlloyPackage Size: 43cmx10cmx2.5cm/16.93inchx3.94inchx0.98inch Package Includes: 1 Nut and Bolt Thread Checker Note: Please allow slightly errors 1-2cm differences due to manual measurement.