Features: Experience convenience in thread measurement with our Portable Precise Thread Size Checker Keychains, a must tool for quick and accurate bolt and nut identification. Crafted from corrosion resistant metal, this Bolt finder is to withstands any job site while offering you portability and ease of use. For mechanical engineers, assembly workers, and DIY enthusiasts, this thread gauge Keychains simplifies the task of measuring various bolt size. Whether on the factory floor, at a machinery repair site, or during a home DIY project, our Nut and Bolt Thread Gauge Identifier ensures you have the tool at your fingertips. Enhances your toolkit's functionality with this Bolt Size Finder Keychains; its 8cm length makes it a indispensable accessory for professional and hobbyists alike. Specifications: Material: Metal Size: About. 8x6x2cm/3.15x2.36x0.79in Package Includes: 2Pcs Thread Size Checker 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.