This vintage Starrett combination square is a must-have for any serious collector of metalworking tools. The square features a 12.0 inch blade length and a 4.0 inch base length, with a 4R graduation style and a steel material construction. Made in the United States, this square is perfect for measuring and inspecting a variety of metalworking projects. The item type is a combination square, and it is ideal for use in business and industrial settings, as well as in CNC, metalworking, and manufacturing industries.