Combination Square Number of Pieces 2 Blade Finish Brushed Blade Material Steel Head Length 3 in Head Width 9/16 in Blade Length 11 13/16 in Blade Thickness 0.08 in Blade Width 3/4 in Graduation Mark Style Etched Graduation Marks - Front 1 mm Head Type Square System of Measurement Metric Head Material Cast Iron Head Vial Included Yes Accuracy +/- .0025 in Features Reversible Lock Bolt Graduation Color Black Graduation Scale 35 Graduation Units Millimeters Head Color Black