Fangrui Product Details Efficient Identification And Customization-our Nuts And Bolt Thread Checkers Are Specially Used For The Most Commonly Used Thread Design, Which Can Instantly Identify 18 Different Public And British-made Sizes. Innovative Drill Size Measurement-the Upper Part Of Our Measuring Instrument Now Includes Drill Size Measurement, Covering The Most Common Size Of 3/32 To 1/2 Inches. It Can Measure The Diameter Of The Drill And Screws, Which Provides Great Convenience For Precise Work. Accurate Length Measurement-our Screw Size Thread Is Equipped With Side Ruler, Which Can Accurately Measure The Length Of Screws, Nuts And Other Tools To Provide Clear And Accurate Results. This Adds Convenience And Accuracy To The Users Workflow. Duravity And Accuracy-built With High-quality Metal, All Columns Are Designed For High-precision Threads. The Tools And Craftsmanship Of This Tool The Reliability And Long -term Durability Under Working Conditions. Portable Design And Practicality-our Measured Screw Inspection Instrument