Quick Measurement: Nut bolt thread gauge is an accurate and easy to use nut and bolt thread identifier that can help you identify or sort out messy screws and nuts in seconds.Standard and Metric Thread Checker: The thread checker can quickly identify different sizes of bolts and nuts, covering the most common thread sizes.Compact Size: Measuring 9.45 inches (24cm) in length, this thread checker is ideal for hanging or using on a workbench. Its compact size makes it easy to carry, allowing you to bring it conveniently to your worksite or project.Length Measurement: The bolt and nut identification board has scale on both sides, from 0-7 inches to 0-18 cm which can help you quickly identify bolts, screws, nuts, and washers of different lengths, very suitable for auto repairers, plumbers, mechanical engineers, and DIY tool enthusiasts.Sturdy Construction: The bolt and nut identifier is made from aluminum alloy and steel material making it well crafted, sturdy, and wear resistant. The scale lines are clear reading, easy to measure, and read accurately. Specification: Material: Aluminum Alloy, Steel Color: Blue Size Chart: 24cm/9.45inch Package Includes: 2 Bolts and Nuts Thread Checkers Note: Please allow slightly errors due to manual measurement and different monitors.