Features: Our thread Checker is a professional tool equipped with 26 thread gauges, including 14 Inch and 12 metric Size. It help you quickly and accurately identify the dimension of screws, bolts and nut, enhancing work efficiency. Inch & Metric Thread Checker tool saves a considerable amount of time. Before starting your project, you can easily thread dimension, especially useful for hard-to-disassemble nut or bolts. Nut and bolt thread Checker is steel, high hardness and wear resistance, not easy to wear and break The SAE and metric thread Gauges Includes 14 inch and 12 metric size, catering to the inspection needs of various nut and bolts. The metric size include: M4x0.7、M5x0.8、M6x1.0、M7x1.0、M8x1.0、M8x1.25、M10x1.0、M10x1.25、M10x1.5、、、; Inch size include: 6-32、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. Specifications: Component:Steel Length:Approx.585mm/23inch Package Includes: 1 Set Bolt Thread Checker note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.