Product Description Double Square, Number of Pieces 2, Head Type Square, Graduation Type 4R, Graduations 8ths/16ths/Quick Reading 32nds/64ths, Head Material Cast Iron, Black Finish, Blade Material Tempered Steel, Regular Blade Finish, Features 1 In. Width, 3/32 In. Thickness Amazon.com This 6-inch double square from Starrett is popular with machinists, toolmakers, and pattern makers because it has a hardened blade and it's equipped with a level. The bevel blade features an octagon angle at one end and a hexagon angle at the other end. The square head is approximately 3-1/2 inches long, and the face is approximately 9/16-inch wide. This tool is made in the USA. From the Manufacturer These squares are very popular with machinists, toolmakers, and patternmakers. See more