[ ]The bolt and nut identifier gauge is made of iron. Ensuring maximum thread strength and accuracy for both standard and metric nuts, sturdy and . [Elevate Your Craftsmanship]Meet the ultimate tool for and professional tasks. With anintuitive design and build, it's ideal for quick problemsolving and perfect results. [Effortless Size Checksin Seconds!]With a sliding knob and clear size markings, this tool enablesquick and precise measurement of bolt sizes. Designed for fast, precise measurement, eliminating guesswork. [Measure Threads Fastand Precisely]Effortless Size Checks in Seconds! Say goodbye to thedays of test-fitting random sockets to find the right size. Savetime and effort. Easy thread size identification with reduced errorrisk, ideal for professionals and enthusiasts. [Convenient Design]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.