Features 1、THREAD SPECIFICATION: 38 screw size and thread gauge covering 17 metric and 21 imperial standards, and extra 10 added specifications. This gauge measuring tool is reliable assistant for technicians and enthusiasts, catering to wide range of thread checking needs 2、QUICK MEASUREMENT: Simply screw the nut or bolt onto the thread checker and you can measure its dimension instantly, providing fast and accurate information 3、SAY GOODBYE TO SORTING AND STORAGE HASSLES: Thread checkers and bolt sizing tools are suitable for everyday mechanical work or household projects, helping you quickly organize and sort your mixed nuts and bolts into neat storage bins. Avoid misaligned, disorganized, or missing items and keep repair tasks efficient and organized 4、STURDY AND LONG LASTING: This thread gauge is made of excellent aluminum alloy material and is long lasting to ensure its reliability and durability, which can be reused 5、COMPACT AND PORTABLE: This thread gauge is compact and easy to carry around, making it easy to take to your workplace or project wherever you go 6、EASY TO STORAGE: Nut and bolt thread checker offer two convenient storage options. With preset mounting holes, can easily attached to the wall without taking up space. Additionally, the added rubber feet ensure stability when placed on a workbench, emphasizing practicality and convenience in tool storage Specification Item Type: Nut Bolt Thread Checker Material: Aluminum alloy Specification: Imperial System: 7/16-14, 7/16-20, 1/2-13, 1/2-20, 9/16-12, 9/16-18, 5/8-11, 5/8-18, M12x1.25, M12x1.5, M12x1.75, M14x1.5, M14x2.0, M16x1.5, M16x2.0 Metric System: 2-56, 4-40, 6-32, 8-32, 10-24, 5/16-18, 10-32, 12-24, 3/8-16, 5/16-24, 1/4-20, 3/8-24, 1/4-28, M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8-1.25, M10-1.0, M10-1.25, M10-1.5 Package List 1 Set of Screw Thread Gauge(2pcs)