A hearty aluminum rafter square for operators who are hard on their tools! Swanson’s 16 in. x 24 in. Heavy-Duty Rafter Square is a big dog built from the ground up with 3/16 in. aluminum alloy. This beast resists impacts & scratches and won’t retain heat out in the sun. Silver anodizing increases durability, and its 16 in. by 24 in. body aids in stud layout.