The Milwaukee 7" Magnetic Rafter Square (MLSQM070) has a stronger frame and is the most versatile rafter square. The rafter layout square features three rare earth magnets giving you a secure hold on ferrous materials. Scribe notches from 1" - 6" allow you to easily and accurately rip lumber. A 1" cutout in the rafter square helps prop pipe allowing you to cut it more easily on the job site. A reinforced frame gives you more durability on the job site while high visibility laser etched markings make the square easier to read.