Stanley, 45300, Square Carpenter. Aluminum English Carpenter's Square is a versatile tool providing a wide range of easy-to-read English measurement scales, tables, and conversions, including the new lumber scale, decimal equivalent table, and metric conversion table; formula for squaring a foundation; 45-degree, 60-degree, and 30-degree angle markings; volume and area formulas; wood screw gauge table; drill and nail sizes (common and finish); quantity per pound; and depth scale.