7", Solid Aluminum, Professional EZ Read Rafter Square, Solid With CNC Machined Edges For Greater Accuracy & Durability, Laser Etched Graduations & Numbers Are Highly Visible, Thick Edge Is Useful As A Saw Guide, Continuous Scribing Notches Are Ideal For Ripping At 3-1/2" & 5-1/2", Low Glare, Protective Anodized Finish.