The Milwaukee 180 mm Metric Rafter Square has a stronger frame and is the most versatile rafter square. The Rafter Layout Square has scribe notches from 25 mm to 145 mm that enable users to easily and accurately rip lumber. A 25 mm cutout in the rafter square provides users with a way to prop pipe to cut it more easily on the job site. A reinforced frame provides users with more durability on the job site while high visibility laser etched markings make the square easier to read.