Combination Square Set Number of Pieces 4 Blade Finish Brushed Blade Material Stainless Steel Head Length 4 in Head Width 4 in Blade Length 12 in Blade Thickness 0.04 in Blade Width Not Applicable Graduation Mark Style Etched Graduation Marks - Front 1 mm 1/32 in Graduation Marks - Back 1 mm 1/16 in Head Type Center/Non-Reversible Protractor/Square System of Measurement Metric/SAE Head Material Cast Iron Includes Blade Head Vial Included Yes Accuracy +/- 0.15 mm