[Upgraded Thread Checking Set] Every is inserted into well cut foam that holds them firmly in place to prevent them from bouncing around in , but not so tight that you can remove them. Easier to use than connected nut/thread checkers, because you no longer have to carry a whole bunch of gauges to measure individual screws or nuts and can reach any tight spot. [ Before Heading to ] Just screw the nut or bolt into the screw thread gauge, it takes you a few seconds to check the size. You do not need to drive forth and back to and from the hardware and auto parts stores for check any more. Also, this nut and bolt gauge is especially well suitable for the distinguish between similar inch and metric threads. [Zinc Plated for Inch Size] 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. [Black Oxide for Metric Size] Includes 12 Metric Sizes part numbers: M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75. (The thread sizes are permanently stamped onto each 26 gauges, inch in black, metric in silver). [Get Your Stuff Well-Organized] This nuts bolts organizer has 26 male/female gauges, all are the most used sizes for everyday use, which can help you well and fast sort out your assorted nuts and bolts and get them well organized and neater in your compartment box from misplace and loss. A great little toolbox if you use fasteners a lot or have a box/drawer/stake/garage full of random nuts and bolts. Colour:black+silver Material:aluminum alloy Package Contents: 26 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.