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Stop guessing thread sizes: Thread a nut or bolt straight into the gauge and read the exact size in seconds — no more trial-and-error or extra trips to the hardware store for the wrong fastener. Works in tight spaces: Each gauge lifts out of the foam tray, so you can take just the size you need into engine bays, machinery gaps and other awkward spots — handy in the garage, workshop, on site or around the house. 52 gauges, sae and metric: 28 blue imperial/SAE gauges (1-12, 1-8, 7/8-9, 7/8-14, 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, 12-24, 10-32, 10-24, 8-32, 6-40, 6-32, 4-40, 2-56;) and 24 red metric gauges (M2-0.4, M2.5-0.45, M3-0.5, 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, M12-1.0, M12-1.25, M12-1.5, M12-1.75, M14-1.5, M14-2.0, M16-1.5, M16-2.0, M18-1.5, M18-2.5, M20-1.5, M20-2.5). Colour-coded so you can tell the two systems apart at a glance. Includes a 58-tooth pitch gauge: On top of the 52 thread gauges, a separate metric/imperial/US pitch gauge checks thread pitch one tooth at a time — covering jobs many checker sets on their own cannot. For mechanics and diyers: Read every size three ways — engraved on the gauge, printed on the label chart and screen-printed on the foam — then snap each gauge back into the storage box to sort mixed bolts and keep them from going missing. And this thread gauge is made of high-quality aluminum alloy, and the surface is covered with red/blue oxide coating to ensure a long service life.