Fangrui Product Details Screw Bolt Nut Thread Measure Gauge Size Checker - Great Tool For Quickly Sorting Bolts And Nuts In A Simple Way, Save Necessary Time To Find The Proper Size Bolt And Matching Nut For Your Project, Its Also Great For Measuring Hardware Before You Take A Trip To The Without Having To Bring One Along To The Store, A Must Have For Your Toolbox, Also Nice Gift For Diy Ers Or Dad. Design - This Bolt And Nut Identifier Gauge Has Holes For Measuring Bolts, And The Pegs On The Sides For Nuts, Both Imperial And Metric, And The Emboss Thread Profile On The Back Side For Identifying Thread Pitches, Easy To Read Markings, And It Has Built In Holes For Hanging , Bright Color Stand Out On Your Workshop Or Garage, And Help You To Faster. Accurate And Solid Built - This Bolt Thread Gauge Is Made Of Heavy Duty Plastic, And The Plastic Is Reinforced With Good Thickness (about 5/32inch) That T Break Easily, Long Lasting Performance, Solid Construction And Clear Text For Easy Reading, Smooth , Without Burr, T Hurt Your Han