Ever found a random bolt or nut in your garage and had no idea what size it is? This thread checker tool takes the guesswork out! It's a solid, metal gauge made from 10B21 carbon steel that lets you quickly identify both US (SAE/Inch) and Metric thread sizes for nuts and bolts. You just screw your bolt into the different holes until you find the one that fits perfectly - that's your thread size and pitch. It's super accurate, durable, and weighs about 2.4 lbs (1084g), so it feels substantial. The interface is straightforward, no manual needed. It's a must-have for DIYers, mechanics, machinists, or anyone who works with hardware. Save yourself trips to the hardware store and the frustration of buying the wrong size. Keep one in your toolbox, workshop, or car for whenever you need to identify or match a fastener. A simple tool that makes projects so much easier.