The Starrett 3020 Toolmakers' Grade Stainless Steel Square 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. Packed one in a plastic case. A 12" square and a set of 4 squares are shipped in a box with fitted foam insert. Wood cases as listed may be purchased separately. Complete Set All Four Squares In Case Wood cases as listed may be purchased separately.