The Inch & Metric Thread Checker is an accurate and easy-to-use thread identifier for both nuts and bolts. Each individual gauge features a male threaded stud on one end and a female threaded hole on the other. The Thread Checker is especially well suited for distinguishing between similar inch and...

The Hillman Horizontal Bolt & Nut Gauge will help you quickly identify the most common size nuts & bolts in one compact and easy-to-use check center. Now you can know with certainty what size bolt or nut you have in your hand. No more guessing! Also known as a Thread Verifier or Thread Identifier, t...