Feature: 1. WIDE RANGE OF SIZES: With 17 metric sizes and 21 imperial sizes, as well as 10 additional specifications, this screw gauge ensures that you can easily identify various thread applications, making it a versatile tool for any handyman or DIY enthusiast. 2. QUICK MEASUREMENT: Simply screw the nut or bolt onto our thread checker, and you can immediately measure its size, providing quick and accurate information. 3. SAY GOODBYE TO SORTING AND STORING HASSLES: Our thread checker and bolt sizing tool are perfect for daily mechanical work or home projects, helping you quickly organize and classify mixed nuts and bolts into a tidy storage box. Avoid misplacing, disorganization, or losing items, and keep your repair or DIY tasks efficient and orderly. 4. DURABLE AND LONG LASTING: Made from premium aluminum alloy materials, this screw gauge is built to last, ensuring its reliability and durability for repeated use. 5. COMPACT AND PORTABLE: The compact size of this thread gauge makes it easy to carry around, allowing you to conveniently bring it to work sites or projects wherever you go. Specification: Item Type: Nut and Bolt Thread Checker Material: Aluminum Alloy . Package List: 2 x Nut and Bolt Thread Checker