[Simplify Your Work]The screw size and thread gauge box is a must-have for handymen, mechanics, and contractors who can now find out the exact size of any nut or bolt in a matter of seconds, simplifying their job and helping them to save time.l guessing at the size of nuts and bolts and going back and forth to the hardware shop? [Improved Design]Unlike similar items on the market, our bolt thread identifier has a with well-made cutouts that hold the thread checkers firmly into place while also allowing you to take them out , simplifying the process. [Versatile and Practical]The screw thread gauge box features a total of 44 male and female gauges in both metric and imperial systems. The silver gauges are for the imperial system measurements, while the black ones allow you to work with the metric system, all in one compact and easy to carry box. [Organize Your Tools]Our bolt thread gauge box is a great way to sort all your nuts and bolts. This allows you to keep your tools well organized and simplify your work through proper inventory. Size Range: Metric sizes included: 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, M14x2.0, M16x1.5, M16x2.0, M20x1.5, M20x2.5, M24x2.0, M24x3.0. Inch sizes included: 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. note: sticker is random color, Cannot be chosen the specific color.please don't mind! Material: carbon steel colour: silver+black Package Contents: 44 x Nut and Bolt Checker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.