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The Hillman Horizontal Bolt Nut Gauge will help you quickly identify the most common size nuts bolts in one compact and easy-to-use check center. Now you can know with certainty what size bolt or nut you have in your hand. No more guessing! The Gauge has 26 female threaded holes 12 metric and 14 standard for checking bolts or screws and 26 male threaded studs 12 metric and 14 standard to identify nut sizes. The bottom edge includes both a metric and standard fractional scale for checking diameter length. It is made from 19 long by 3-1/2 wide by 1/4 thick annodized aluminum plate. It includes a pair of angle brackets and is pre-drilled for easy installation on a work bench or wall.