Features 1、Multiple Sizes: This gauge offers 28 thread sizes and 8 pitch sizes, with 0-150mm metric and 0-6 inch imperial measuring range, allowing you to identify various thread sizes and measure lengths quickly and accurately 2、Aluminum Alloy: This thread inspection gauge is made of excellent aluminum alloy, with a hardened finish and fine processing to ensure high strength, wear resisting, erosion resisting, and high accuracy 3、Clear Markings: The etched markings on the thread gauge ensure durability, friction resisting, and easy identification, improving work efficiency by providing a fast and accurate method to identify standard hardware sizes 4、Accurate and Quick: This thread checker allows you to quickly organize scattered nut and bolt piles, confirm the types of bolts or nuts, and classify them; With bit size recognition function (3mm 4mm 5mm 6mm 7mm 8mm 9mm 10mm) 5、Wide Application: Identifying and measuring various types of screws, nuts, and bolts, solving all bolt and nut problems you encounter in daily maintenance and manufacturing, suitable for professionals and craft enthusiasts Specification Item Type: Bolt and Nut Thread Checker Material: Aluminum Alloy Size: Approx. 200 x 200 x 20mm / 7.9 x 7.9 x 0.8in Package List 1 x Thread Checker