DarSeity DS-34 Nut and Bolt Thread Checker with Inches (Standard) and Centimeters (Metric).
34 Thread Gauge: 15 Metric + 19 Standard Nut & Bolt Size, Inch and Centimeter scales on the edge, Quickly identify size & length. Append 8 Sizes Drill Gauges 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 1/4", 1/2", to help you quickly and accurately size your screws and recommend the size of drill or tap needed for your screws.
Wide Range of Identification: 15 Metric Sizes: M4 x 0.7 to M16 x 2.0, 19 Standard Sizes: #6 – 32 Fine to 3/4 – 10 Fine, Length Measurement: 0-15cm / 0-6 inch. Fast Identification & Measurement.
With 2 pre-drilled mounting holes, it can be easily hung on the wall or fixed in the toolbox.