QUICK AND ACCURATE MEASUREMENT: Designed for fast and precise thread size verification, this tool eliminates guesswork, saving you time and effort on the job. 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 reach when you need it. EASY-TO-READ MARKINGS: Clearly engraved size markings provide easy identification of thread sizes, reducing the risk of errors and making it a reliable tool for professionals and DIY enthusiasts alike. CONVENIENT UNIT READING DESIGN: This thread checker features both metric and imperial units, providing versatility and convenience., ensuring accurate measurements for any project. DURABLE CONSTRUCTION: Made from high-quality, corrosion-resistant material, this tool is built to withstand heavy use and harsh environments, ensuring long-lasting performance. Colour:Silver Material:iron Package Contents: 1 * Portable Precise Thread Size Checker Keychain Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.