IRWIN Tools Carpenter Square, Steel, 8-Inch by 12-Inch (1794462) 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 that are durable. The steel body is rust-proof and weather-resistant. 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.