IRWIN Tools Carpenter Square, Steel, 16-Inch by 24-Inch (1794461) Permanent, deep carpenter square stampings for durability Construction square is used for laying out and marking angles in framing, roofing and stairway work Layout square is also used for checking squareness and flatness Steel construction Dimensions: 16" x 24" Permanent, deep carpenter square stampings for durability Construction square is used for laying out and marking angles in framing, roofing and stairway work Layout square is also used for checking squareness and flatness Steel construction Dimensions: 16" x 24"