Features: Each size has a nut and bolt checker on the same gauge. 26 male/female meter-14 inches and 12 metric. The thread size is permanently printed on each gauge (red for inches, white for metric). The imperials gauge is galvanized silver color, and the metric gauge is black oxides. A single gauge rotates freely on wire rope to quickly check the thread. Cable with loop for easy hangings. Specifications: Material:Carbon Steel Includes 14 Inch Size part numbers: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20 Includes 12 Metric Sizes part numbers: M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, Package Includes: 26Pcs Nut & Bolt Thread Checker note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.