Features: Nut&Bolt Thread Checker Sizes: The thread checker is able to identify 28 different sizes for both nuts and bolts. Including Metric thread sizes from M4 x 0.7 to M14 x 2.0 and Imperial thread from #6 - 32 Coarse to 1/2 - 20 Fine. It will greatly help to classify different fasteners regularly. Excellent Quality: The identibolt is CNC machined from 6061 aluminum with anodized surface process. And the thread is made of 304 stainless steel. The scale lines are laser etched which provides quick and accurate identification for various thread sizes. Multifunctional Design: This nut and bolt thread checker allows you to verify the size and thread pitch of your nuts and bolts quickly. It also comes with Metric and Imperial measurement on both sides to quickly identify the length and diameter of the bolts, screws, nuts and washer. Compact and Convenience: Different from other thread checker, this bolt checker is square designed with compact size for saving space. It's with three mounting holes to fix on the wall or work table. Ideal for Various Works: The screw gauge is perfect for various works through organizing the messy bolts and nuts in short time. It will be a great help for mechanics, machinists, repairmen and DIY enthusiast. Specifications: Product Name: Nut and Bolt Thread Checker Set Material: Aluminum Alloy Surface dealing: high temperature nickel-based dealing Color: Red Size: 20?Á20?Á2.5cm/ 7.87?Á7.87 inch Shape: Square Parts List: 1 Set of Nut and Bolt Thread Checker