IRWIN Tools Framing Square, Aluminum, 16-Inch by 24-Inch (1794448) Irwin Aluminum Framing Square 16 In X 24 In The IRWIN Tools 1794448 Aluminum Framing Square 16 X 24" features Permanent deep stampings for durability This is manufactured in China This professional tool has permanent deep stampings are durable. The aluminum body is rust-proof and lightweight. 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.