Double Square Number of Pieces 2 Blade Finish Brushed Blade Material Stainless Steel Head Length 1 1/16 in Head Width 1 1/16 in Blade Length 6 in Blade Thickness 0.05 in Blade Width 2 1/2 in Graduation Mark Style Etched Graduation Marks - Front 1/64 in Head Type Square System of Measurement SAE Head Material Cast Iron Includes Blade Head Vial Included Yes Accuracy +/- 2min Blade Coating Powder Blade Color Black Graduation Color Black Graduation Scale 4R