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The Starrett 3020 Toolmakers Grade Stainless Steel Square is a high quality combination square precision tool. It is Not graduated and offers squareness accuracy to 0.005mm (0.0002") for every 150mm (6"). It features hardened, ground and lapped stainless steel construction on both the blade and the beam. The beam is machined at the inner corner for clearance of burr or dirt. It comes packed in a plastic case. Wooden cases are sold separately. The L.S. Starrett Company manufactures precision measuring tools, metrology, and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.