High-quality hardened steel for durability. Embossed graduations and markings for easy readability. Graduations and markings on both sides of square makes measuring more efficient. Provides helpful reference conversion tables including: lumber scale, decimal equivalent and Metric conversion table, formula for squaring a foundation, 45°, 60°, and 30° angle markings, volume and area formulas, wood screw gauge table, nail sizes (common and finish), and quantity per pound and depth scale. Surface treated with a protective clear coating to resist corrosion and to extend the life.