Features 1. Excellent recognizability: It has standard and metric dimensions, ultimate accuracy, meets and does not pass 2b ANSI standards, standard bolts and nuts meet components with 2a and 2b hreads, consisting of 2a screws and 2b screw holes. 2. Drill gauge: This 34 types of nut and bolt thread checker has 8 different sizes of holes, which are 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 1/4 inch, and 1/2 inch, respectively. These sizes can help you quickly and accurately determine the screw size and recommend the required tap size for drill bits or screws. 28 types of nut and bolt thread inspectors do not have this screw size. 3. High quality: The bolt and nut identification device is made of 6061 aluminum alloy and 12.9 grade alloy steel threads processed by CNC, and the anodized surface makes it stable and durable. The scale lines are laser printed, and the easily readable markings are designed with a bright white black background. 4. Length measurement: This screw size and thread gauge is equipped with a ruler at the edge, which helps to quickly identify the length of bolts, screws, nuts, and washers. 5. Easy to use: The bolt identification plate is an accurate and easy-to-use nut and bolt thread verifier, with holes on the top for easy placement on a workbench or installation on a wall. Specification Material: Metal Style: 28 types, 34 types Color: Black, Red Size: 43 x 10 x 2.5 cm, 50 x 10 x 2.5 cm Weight: 990 g, 1100 g Package Include: Nut and Bolt Thread Checker