Square - Milwaukee 12 in. True Blue® Laser Etched Rafter Square, E3992Item #: E3992 The Empire True Blue laser etched 12 in. Rafter square (E3992) has permanent laser markings for superior readability in any light condition. Scribe guide precision scribe notches allow for easily marking parallel lines on lumber. Hi visibility laser etched markings won't fade after heavy use. The rafter layout square is made from a durable anodized aluminum that is more durable than diecast and will not rust or corrode. The Empire rafter