●DarSeity DS-28 Nut and Bolt Thread Checker with Inches (Standard) and Centimeters (Metric). ●28 Thread Gauge: 14 Metric + 14 Standard Nut & Bolt Size, Inch and Centimeter scales on the edge, Quickly identify size & length. ●Industrial Grade: Heavy-duty Solid Aluminum Body (Anodized Surface, 6mm, 2.2lb ), Durable SUS304 Bolt, Machined with ultimate precision. ●Wide Range of Identification: Metric Sizes: M4 x 0.7 to M14 x 2.0, Standard Sizes: #6 ? 32 Fine to 1/2 ? 20 Fine, Length Measurement: 0-15cm / 0-6 inch. Fast Identification & Measurement. ●With 3 pre-drilled mounting holes, it can be easily hung on the wall or fixed in the toolbox.