Johnson 12 in. L Aluminum Rafter Square

12in Johnny Square Aluminum Rafter Square. As A Saw Guide, Stair Layout Tool Or Rafter Tool, Johnson's Rafter Square Will Help You Get The Job Done Accurately And Easily. Its Solid Aluminum Body Construction With CNC Machined Edges Provides Greater Accuracy Along With Durable Chip-Resistant Coating. Use The Scribe Notches For Marking And Ripping Lumber, And Handy Markers That Measure 2x4 Board Dimensions Of 1-1/2", 3" And 3-1/2". This Square Also Has Deep Cast-In Graduations That Will Never Peel Off, Wear Off, Fade Or Smudge. * * *