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A must-have for any garage or workshop, this bolt size gauge is excellent for sizing bolts, screws, nuts (USS, SAE and Metric), washers (USS, SAE) and twist drills. A unique feature of this tool is that it has both US and Metric thread pitch injection-molded right into it! Simply hold up the threads of your bolt and quickly and accurately check the thread pitch (without having to go to the hardware store or trial-and-error thread different nuts onto the bolt in question). This reliable and accurate tool resists water, alchol, oil and grease. It measures 8-5/8 inches by 3-1/4 inches, compact enough to slip in your pocket.