Item Type: Nut and Bolt Thread Checker Material: Aluminum alloy Black: Includes 12 metric size 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. Silver: 14 sizes included Part No.: 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 Package List 1 x Nut and Bolt Thread Checker 1Clearly Marked Thread Size: The thread size is permanently etched on each gauge with clear markings, making it easy for you to identify and determine the size. 2Saves Time and Effort: No more bending over or searching for nuts and bolts to complete your projects, especially for those that are non removable. This saves you time and effort, allowing for a more efficient working process. 3Comprehensive Size Options: Each size comes with a matching nut and bolt checker, making it a must have tool for every workshop. This ensures that you have the right tool for every job. 4Durable Material: These nut and bolt thread checkers are made of aluminum alloy, which is hardness, not easy to deform, sturdy and durable and has a long service life. 5Portable Solution: Conveniently assembled into a wire loop, it serves as a perfect portable solution. You can easily carry it with you wherever you go, ensuring that you have a reliable thread checker at your fingertips.