【Detachable Nut & Bolt Thread Checker】The Inch & Metric Thread Checker design with detachable wire loop in both ends, you can open or off to use anywhere, provides more possibilities for using space. Also you can select individuals or parts to use or take out frequently used parts and use them in a single wie loop. 【Upgraded Double-sided Printing Size】This Nut and Bolt Thread Checker with upgraded double-sided sizes by laser printing, it solve the problem that may need to be rotated to see the size during use, more convenient and faster to use. The laser print marking ensure that the color and mark will not fade after, even will be more obvious a long period of use. 【Inch Size - Includes 23 Inch Size part numbers】 6-32, 6-40, 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, 9/16-12, 9/16-18, 5/8-11, 5/8-18, 3/4-10, 3/4-16,1-8, 1/12 【Metric Size - Includes 21 Metric Sizes part numbers】M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75, M14x1.5, M14x2.2, M16x1.5, M16x2.0, M20x1.5, M20x2.5, M24x2.0, M24x3.0 【Fast Size Finder】This Nut & Bolt Thread Checker each size has a nut and bolt checker on the same gauge 44 male/female gauges - 23 inch & 21 metric. Thread sizes are permanently stamped onto each gauge. The individual gauges rotate freely on the wire cable for fast thread verification.