12", Solid Aluminum, Professional EZ Rafter Square, Solid Aluminum Body For Assured Durability & Precision CNC Machined Edges For Guaranteed Accuracy, Laser Etched Graduations & Numbers Are Highly Visible, Thick Edge Is Useful As A Saw Guide, Continuous Scribing Notches Are Ideal For Ripping At 1-1/2", 3-1/2" & 5-1/2", Low Glare EZ Read Protective Anodized Finish, 1/8" Scale Reads From 1-1/2" To 8-1/4", Marking Lines For 45 Degree Miter Cuts.