Bolt / Nut / Screw Size Gauge Inch (SAE) and Metric Inch and Metric, Coarse and Fine Thread Screw thread pitch gauge for metric (.70 to 2.5mm) and inch (10 to 40 threads per inch) Measures bolts and screws up to 7 long (180mm) Measures nuts - Coarse and Fine thread from #6 to 5/8 diameter Measures bolts and screws up to 1 diameter (22mm)