The longer part is called the blade, and the shorter part is the tongue these join at the heel. They are generally made from aluminum or steel and are shaped like the letter “L.” Though the standard size is 24 inches by 16 inches, they can also be found in other sizes. You can find carpentry squares that are designed to fit in your pocket and ones that are made to work with different surfaces such as wood or brick. These tools are also referred to as rafter squares, roofing squares and flat squares. They can also be used as straightedges to determine how linear and flat surfaces are. Carpentry squares are a great tool for anyone who needs to lay out and mark patterns in frames, stairways and roofs.