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Starrett # C11H-12-4R This is the standard configuration for an adjustable square. The precision ground cast iron head includes a small bubble level, a 90ø face, 45ø face, and small marking scribe. Backing off the thumbscrew allows the head to slide along the fully hardened, 12" satin chromed blade, which is precisely etched with graduations in 8ths, 16ths, 32nds, and 64ths. Made in USA.