[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 easily, simplifying the process. 3 Clear Ways to Read Size: Another highlight of this screw gauge is that you can clearly and easily read the gauge size in three ways: sizes are engraved on the gauges themselves, a size chart on an art paper sticker, and sizes screen-printed on foam. Each size on the chart or foam corresponds to the respective thread gauge, making it visually easier to match and pick out the desired size. 23 Inch & 21 Metric: Inch sizes are in blue, including 1-12, 1-8, 3/4-16, 3/4-10, 5/8-18, 5/8-11, 9/16-18, 9/16-12, 1/2-20, 1/2-13, 7/16-20, 7/16-14, 3/8-24, 3/8-16, 5/16-24, 5/16-18, 1/4-28, 1/4-20, 10-32, 10-24, 8-32, 6-40, 6-32; Metric sizes are in red, including M3-0.5, -0.7, M5-0.8, M6-1.0, M7-1.0, M8-1.0, M8-1.25, M10-1.0, M10-1.25, M10-1.5, M12-1.25, M12-1.5, M12-1.75, M14-1.5, M14-2.0, M16-1.5, M16-2.0, M20-1.5, M20-2.5, M24-2.0, M24-3.0. Quick Identification and Time Saver: Simply screw the nut or bolt onto the thread gauge to check the size. It takes only seconds to determine the size. With standard and metric , you can easily and quickly verify the correct size of nuts and bolts, replacing snapped, loose, rusted, or old ones or in the garage by yourself. No need to make trips to the for size checks anymore, significantly improving your workefficiency. Colour:silver+black Material:Metal Package Contents: 1 x kit(Stickers are random, don't accept the specified) 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.