Features and Benefits: ?Scribe notches from 25mm – 145mm ?25mm cutout props pipe ?High visibility laser etched markings ?28.5mm heel ?Precision machined extruded aluminum The Milwaukee? 180 mm metric rafter square has a stronger frame and is the most versatile rafter square. It features scribe notches from 25 mm to 145 mm allowing for easy ripping of lumber. A 25 mm cutout helps prop pipe making it easier to cut on the job sites. A reinforced frame provides durability on the job site and high visibility laser etched markings make it easy to read.