Sorby Threading & Sizing Gauge is an essential tool designed specifically for box makers and anyone working with thread cutting on a lathe. This gauge takes all the guesswork out of dimensioning projects by providing precise measurements to ensure thread fits. Featuring an unmarked anvil set to create a 1:1 correlation between the measuring faces, it facilitates accurate push fits every time. The gauge includes three additional anvils marked 10, 16, and 20, corresponding to the most common threads per inch (TPI) used by thread cutters. With a built-in compensation factor, this tool s a tight and fit between internal and external diameters, making it a reliable choice for precision threading tasks. Crafted in England, it combines quality and functionality for professional results. Model Number: H973000