Our 12" Rafter Square has a stronger frame to withstand harsh jobsite conditions and provides better holds on material with its wider 1-1/8" heel. With 1/8" scribe notches from 1"-10", this rafter square makes ripping lumber easier and more accurate. Our 12-inch rafter square also has high-visibility laser-etched markings, so it's easier to read. All Milwaukee squares are backed by a Limited Lifetime Warranty.