Efficient identification and customization - Our nuts and bolt thread checkers are specially used for the most commonly used thread design, which can instantly identify 18 different public and British-made sizes. Innovative drill size measurement - The upper part of our measuring instrument now includes drill size measurement, covering the most common size of 3/32 to 1/2 inches. It can measure the diameter of the drill and screws, which provides great convenience for precise work. Accurate length measurement - Our screw size thread is equipped with side ruler, which can accurately measure the length of screws, nuts and other tools to provide clear and accurate results. This adds convenience and accuracy to the user's workflow. Duravity and accuracy - built with high-quality Metal, all columns are designed for high-precision threads. The tools and craftsmanship of this tool the reliability and long -term durability under various working conditions. Portable design and practicality - Our measured screw inspection instrument is specially designed for portable design with drilling and non-slip pads, which is convenient for wall installation or placing on the workbench. This easy-to-install and use design makes it an indispensable tool for professional and DIY lovers, which improves work efficiency. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Blue Material:aluminum alloy Package Contents: 1 * Nut and Bolt Thread Checkers 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.