S&W Wall Mounted Thread Checker Easy-To-ReadFeatures Quickly identify the most common size nuts & bolts in one easy to display center! Starting from the top you have 28 female threaded holes to identify common inch & metric bolt sizes, following that you'll find 28 male threaded studs to identify nut sizes and at the bottom you'll find screw diameter & bolt length checkers. Mounted on heavy duty 1 2 Inch Sintra board and predrilled for easy installation, the Wall Mounted Thread Checker is ready
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