1、WIDE RANGE OF SIZE CHECKING: Nut and bolt thread detector can help you identify 44 distinct sizes of nuts and bolts, featuring metric thread sizes spanning from M3x0.5 to M24x3.0 and Imperial thread sizes ranging from 6‑32 Coarse to 1‑12 Fine, which can help you identify different sizes of nuts and bolts quickly and easily 2、TIME SAVING AND USER FRIENDLY: This red nut and bolt thread detector is necessary to quickly identify the most common nut and bolt sizes 3、MULTIPLE OPTIONS: Bolt size thread gauge identifier come with 44 holes to choose from, you can measure nuts and bolts in a variety of sizes, including metric and imperial sizes. This make the tool highly suitable for a variety of tasks and industries 4、CONVENIENT AND DIRECT: This thread checker is very convenient and easy to use. Simply insert the nut or bolt and determine dimension directly, eliminating the need for time consuming measurements 5、PRE DRILLED MOUNTING HOLES: Nut and bolt thread checker is designed with 2 pre drilled mounting holes on the top, easy to hang on the wall when you're done using or attach to your toolbox for easy access when you need