Description: 【Premium Material】: Nut bolt thread gauge is made of aluminum alloy material, with solid structure and well made. The scale line reading is clear, the measurement is convenient and the reading is accurate. 【Standard and Metric Thread Checker】: Thread checker can quickly identify 28 different sizes of bolts and nuts. The metric thread size ranges from M4×0.7 to M14×2.0, and the standard thread size ranges from 6-32 Coarse to 1/2-20 Fine. 【Quick Measurement】: The Bolt and nut identification board 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. 【Length Measurement】: The Bolt and nut identifier has scales on both sides, from 0-6 inches to 0-15 cm, which can help you quickly identify different lengths of bolts, screws, nuts and washers. 【Wide Application】: The bolt and nut identifier is suitable for car mechanics, plumbers, mechanical engineers and DIY tool enthusiasts. Specification: Material: Aluminum Alloy Size Chart: 20cmx20cmx2.5cm/7.87inchx7.87inchx0.98inch Package Includes: 1 Nut and Bolt Thread Checker Note: Please allow slightly errors 1-2cm differences due to manual measurement.