Welcome to our shop! Product Information: DURABLE CONSTRUCTION: Made of high-quality material, this measuring tool is built to withstand heavy use and harsh environments, ensuring long-lasting performance. QUICK AND ACCURATE MEASUREMENT: Designed for fast and precise thread size verification, say goodbye to guesswork, saving your 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 thread size checker can be conveniently attached to your keys or belt, ensuring it's always within reach when you need it. CONVENIENT UNIT READING DESIGN: This thread checker features both metric and imperial units, providing versatility and convenience, ensuring accurate measurements for any project. 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. Specification: Package Included: 1/2Pcs x Keychain (As your choice) Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)