1、Multiple Sizes: This bolt and nut identifier gauge has 28 common thread sizes, 14 imperial and 14 metric, making it easy to quickly and accurately differentiate between different sizes of bolts and nuts, solving all your daily problems with bolts and nuts, maintenance and machining. 2、Sturdy And Robust: This bolt and nut gauge is made of excellent quality aluminium alloy and stainless steel material with hard anodized surface. The rust proof steel threaded posts are firmly embedded in the blind holes on the identification gauge, and the back of the plate is sleek and beautiful. All text logos are laser engraved, friction resistant, clear and easy to identify. 3、Edge Ruler Design: This bolt size and thread identifier gauge has inch and centimetre scales on the edge to help you quickly and accurately measure the length of bolts, screws, nuts, washers, saving you a lot of time and effort and improving your work efficiency. 4、Easy To Use: This nut and bolt thread checker has top and bottom mounting holes give you the option of hanging it on the wall or securing it in your toolbox, which makes it easy to use and store. 5、Time Saving: This screw bolt size and thread gauge is easy to use, you need to screw the bolt or nut into the thread gauge, it only takes a few seconds to quickly and accurately know the size of different bolts or nuts, very practical and rugged, saving your time.