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The thread checker is an accurate and easy-to-use thread verifier for both nuts and bolts Conveniently assembled onto a wire loop it is especially well suited for distinguishing between similar inch and metric Threads Each size has a nut and bolt checker on the same gauge The thread checker is an accurate and easy-to-use thread verifier for both nuts and bolts. Conveniently assembled onto a wire loop it is especially well suited for distinguishing between similar inch and metric threads. Each size has a nut and bolt checker on the same gauge. Thread sizes are permanently stamped onto each gauge. Inch gauges are clear Zinc plated metric gauges are Black oxide. Wire cable with loop for convenient hanging.