IRWIN Tools Framing Square, Steel, 16-Inch by 24-Inch (1794449) Made from proprietary steel and heat-treated to control hardness The forged tip allows for a secure grip and maximum contact eliminating stripping The Shockwave Impact Duty accessory line is not only ideal for heavy-duty impact applications This professional tool has permanent deep stampings are durable. The Stainless Steel body is rust-proof and exceptionally durable. The square has multiple scales: 1/8-, 1/10-, 1/12-, and 1/16-inch. Features rafter tables, brace and octagon scales and Essex board measure. Can be used as a protractor, saw guide, and ruler.