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Johnson Rafter Angle Square *Material: Aluminum *Product Type: Rafter Angle Square *Product Length: 12 in. *Color: Gray*Solid die cast aluminum rafter angle square with CNC computer machined edges for greater accuracy and durability*Its permanent mold graduations and numbers are easy to read*Features scribe notches starting at 1-3/4" transfers outside increments from pivot point*The large body spans wider boards simplifying layout and measurements*These squares are ideal for quick and easy angle cuts. Use them for rafters, roof layouts, stair layouts and more*Comes with a complete instruction manual including rafter tables.