Combination Square Set Number of Pieces 4 Blade Finish Satin Blade Material Steel Head Length 3 in Head Width 9/16 in Blade Length 12 in Blade Thickness 0.08 in Blade Width 3/4 in Graduation Mark Style Etched Graduation Marks - Front 1/64 in Head Type Center/Reversible Protractor/Square System of Measurement SAE Head Material Steel Includes Blade Head Vial Included Yes Accuracy +/- .0025 in Blade Coating Chrome Features Head has Spirit Level and Hardened Scriber