Built from stainless steel for durability and corrosion resistance, this pipefitter's square is designed to help fit pipe accurately to elbows using dedicated set-backs. Its markings include a pipe center line, 1/16-inch ruler graduations, tangent and degree scales, while the reverse-side TAN and decimal charts support pipe layout calculations. Designed for pipefitters, boilermakers, welders, and other layout professionals, it helps streamline measurement and fit-up tasks.