【Quickly Measure Bolts and Nuts】: It is an accurate and easy to use nut and bolt thread identifier that helps you identify or organize messy screws and nuts in seconds. 【High Performance】: Nut and bolt thread checker can quickly identify 34 different sizes of bolts and nuts, including 19 standard sizes (6-32 to 3/4-16 Fine) and 15 metric sizes (M4x0.7 to M16x2.0), covering the most common Thread size. 【Bolt and Nut Identifier Gauge】: Features 8 different sizes of drill bit gauges including 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 1/4", and 1/2" to quickly and accurately determine screw size. 【Premium Material】: Screw size and thread gauge bolt identifier board is made of quality aluminum alloy and alloy steel threads, well made, stable, and durable. The scale lines are clear and easy to read. 【Wide Application】: A simple nut and bolt measuring tool is great for car mechanics, plumbers, mechanical engineers, and DIY tool enthusiasts. Specification: Material: Aluminum Alloy Product Size: 55cmx11cm/21.65inchx4.33inch Package Includes: 1 Nut and Bolt Thread Checker Note: Please allow slightly errors due to manual measurement and different monitors.