Fast and Accurate Measurements: 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 to tighten and measure with one hand. Keychain Attachment: Equipped with a keychain ring, 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 easy to identify thread sizes, reducing the risk of errors, making it a reliable tool for professionals and DIY enthusiasts. Convenient Unit Reading Design: This features both metric and imperial units, providing versatility and convenience, ensuring accurate measurements for any project. Construction: Made of high-quality, - materials, this tool can withstand frequent use and harsh environments, ensuring long-lasting performance. Colour:Silver Material:Metal Package Contents: 1 * 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.