Features: This double Metric and SAE Thread Gauge is a indispensable tool for quickly identifying 28 different size of nut and bolts, ensuring precisions in every measurement. Crafted from high quality metal, this thread checker features clear, easy to read scales on both Metric and Standard side for use. For professional in engineering, automotive repair, industry, as well as DIY enthusiasts about thread measurement. Thread gauge is perfect for measuring various threaded parts such as threaded pipe and studs, widely applicable in manufacturing, maintenance industry, and laboratory setting. Enhances your toolkit's capabilities with this aluminum thread gauge, for long performances and accuracy in most demanding projects. Specifications: Material: Aluminum Size: About. 200x200mm/7.87x7.87in Package Includes: 1pc Screw Identification Gauge note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.