Features QUICK AND ACCURATES MEASUREMENT: Designed for fast and precise thread size verification, this tool eliminates guesswork, saving you time and effort on the jobs. Quickly confirm workpiece size by sliding the knob with one hand to tighten and measure. KEYCHAIN ATTACHMENT: Equipped with a keychain-loop, this checker can be conveniently attached to your keys or belt, ensuring it's always within reaching when you need it. EASY-TO-READ MARKINGS: Clearly engraved size markings provide easy identification of thread sizes, reducing the risks of errors and making it a reliable tools CONVENIENT UNIT READING DESIGN: This thread-checker features both metrics and imperials units, providing versatility and convenience., ensuring accurates measurements for any project. STURDY CONSTRUCTION: Made from corrosion-resistant material, this tool is built to withstand heavy use and harsh environments, ensuring long-lasting performance. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Iron Size: 8.2x3x1cm Package List: 1x Portable Precise Thread Size Checker Keychain