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 Hylissus's standard and metric thread checker, you can easily and quickly verify the correct size of nuts and bolts, replacing snapped, loose, rusted, or old ones at home or in the garage by yourself. No need to make trips to the hardware store for size checks anymore, significantly improving your work efficiency

US Standard

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

M4-0.7, 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