This set of two nut and bolt thread checker gauges is an essential tool for any workshop or garage. With 38 holes in total, it allows you to easily identify 17 metric and 21 imperial sizes, as well as 10 additional specifications. The gauges are made from durable materials and feature clear markings for each size, making it easy to quickly determine the correct thread size. Whether you're working on a car, machinery, or a home improvement project, these thread checkers will save you time and frustration by ensuring you have the right nuts and bolts for the job. Compact and portable, they are a must-have for any DIY enthusiast or professional tradesperson.