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A revolutionary framing square (Carpenters Square) that can be disassembled and fit into a tool box for easy and safely transporting. Once fully assembled is a full size 16x24 framing square. Made of durable plastic with a ball and detent to lock pieces together with an aluminum slide ruler. Square is perfect 90 degrees. Made in the U.S.A. Invented and patented by a Pile Driver who worked on the Alaskan Pipeline and needed a way to fly with and transport his framing square without getting it damaged. Tool box in picture is for reference and not included with sale.