Specification Brand : M & J Tooling LLC BulletPoint1 : Aluminium Alloy Material: Our nut and bolt thread checker is made of aluminium alloy and all struts are made of enduring SUS carbon steel with nickel plating. It has a hard anodised surface and rust-resistant threaded pins that are securely fastened into the holes of the inspector for long-lasting endurance BulletPoint2 : 44 Thread Size Checker: Our thread identifier makes it easy to identify 44 different sizes of bolts and nuts. Metric thread sizes from M4 x 0.7 to M14 x 2.0 and imperial thread sizes from 6 - 32 to 1/2 - 20 help you quickly and easily identify different sizes of nuts and bolts BulletPoint3 : Clear Scale: The thread gauge measuring tool has inch and centimetre scales engraved on the edge of the tool, which is clear and easy to compare, helping you to quickly identify the size of bolts and nuts. Note: Always wear work gloves when comparing to protect your hands from accidental injury BulletPoint4 : Four Pre-drilled Mounting Holes: The Thread Gauge has four pre-drilled mounting holes on the top of the gauge to make it easy to hang on the wall. You can also attach it to your tool box for easy access BulletPoint5 : Quickly Compare Sizes: This product is suitable for professional technicians and DIY enthusiasts. It helps to compare precise dimensions quickly and accurately. Easy to use, can meet your various needs IncludedComponents : 1 x Nut and Bolt Thread Checker ItemName : New 1/4 28 UNF 2B Left Hand Thread Plug GAGE .25 GO NO GO PDS= .2268 & .2311 LH - DW32920MJ ItemTypeKeyword : thread-gauges Manufacturer : M & J Tooling LLC NumberOfItems : 1 PartNumber : DW32920MJ ProductDescription : YOU ARE PURCHASING THE PICTUREDLEFT HAND THREAD PLUG GAGE.