Sturdy and DurableOur Nut and Bolt Thread Checker is crafted from 6061 aluminum alloy, and all pillars are made of durable SUS304 material, and it has a hard anodized with rust-resistant threaded pins firmly set in the holes of the identification gauge, making this tool more durable Wide Range of Size CheckingOur Nut and Bolt Thread Detector can help you identify 28 distinct sizes of nuts and bolts, featuring metric thread sizes spanning from M4*0.7 to M14*2.0 and Imperial thread sizes ranging from 6-32 Coarse to 1/2-20 Fine, which can help you identify different sizes of nuts and bolts quickly and easily. Remember to wear work gloves to protect your hands while working Pre-drilled Mounting HolesOur Nut and Bolt Thread Checker is designed with 3 pre-drilled mounting holes on the top, making it easy to hang it on the wall when you're done using it or attach it to your toolbox for easy access when you need it. Please wear work gloves during work to avoid accidental injury Clear and Durable Laser ScaleThe Bult and nut gauge features laser-etched inch and centimeter scales on the edges, which are clear and easy to compare, and will assist you in quickly and easily identifying the size of your bolts and nuts. Please Note: Please be sure to wear gloves to protect your hands during the comparison Meeting Your NeedsWhether you are a professional mechanic or an enthusiastic DIYer, you don't need to go to the hardware store for comparison, this bolt and nut checker plate can help you quickly and accurately compare the exact size; and it won't get tangled up like the previous coil-type identifiers, which affects the use