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Home Depot [homedepot.com] has 2-Pack Milwaukee 7″ Rafter Square on sale for $19.97. Shipping is free.

Details:Milwaukee 2-pack 7 in rafter squares
Precision-machined extruded aluminum; made in USA
Scribe notches 1–6 in; 1-1/8 in heel; 1 in pipe-prop cutout
High-visibility laser-etched markings