35 Bolt and Nut Identifier Gauge: AIGOGO nut and bolt thread checker standard and metric accurately identifies 35 different sizes, including 16 metric sizes ( M2-0.4 to M12-1.75), 25 standard sizes (2-56 Coarse to 1/2-20 Coarse),and imperial and centimetre rulers, making it an essential tool for professionals and DIY enthusiasts 16 Metric Thread Sizes:M2-0.4, M2.5-0.45, M3-0.5, M4-0.7, M5-0.8, M6-1.0, M7-1.0, M8-1.0, M8-1.25, M10-1.0, M10-1.25, M10-1.5, M12-1.0, M12-1.25, M12-1.5, M12-1.75 19 Standard Thread Sizes: 2-56 Coarse, 4-40 Coarse, 6-32 Coarse, 6-40 Fine, 8-32 Coarse, 8-36 Fine, 10-24 Coarse, 10-32 Fine, 12-24 Coarse, 1/4-20 Coarse, 1/4-28 Fine, 5/16-18 Coarse, 5/16-24 Fine, 3/8-16 Coarse, 3/8-24 Fine, 7/16-14 Coarse, 7/16-20 Fine, 1/2-13 Coarse, 1/2-20 Fine Portable Dual-board Design: The bolt and nut sizer adopts ergonomic design, easier to hold in one hand. Board A for small size and board B for large size, which is suitable for different usage scenarios and identify threads anywhere anytime. The thread size checker has double holes, makes it easy to hang on the wall and saves storage space Premium Quality and Durability: Our thread gauge sae and metric are crafted from high-grade CNC machined anodized 6061 aluminum alloy, and complies with American unified thread standard. The bolt identifier board utilize laser etching technology to ensure clear and accurate readings, and the numbers will not fade or peel off even after repeated heavy use Easy to Use: This lightweight bolt size and thread gauge can not only help you solve common problems related to bolts and nuts, it can also quickly assist you in classifying the mixed nuts and bolts. Identify any bolts nuts within just a few seconds, no longer having to guess the sizes. A perfect gift for mechanics, engineers, woodworkers, and DIYers who love fixing, building, and working with tools No more trial and error! Simply screw a nut or bolt onto the checker to instantly determine its size. This time-saving screw and thread checker help you quickly match thread sizes and pitches, ensuring you always have the right fit for your project. A perfect gift for mechanics, engineers, woodworkers, and DIYers who love fixing, building, and working with tools!