Combination Square Number of Pieces 2 Blade Finish Satin Blade Material Steel Head Length 4 1/2 in Head Width 3/4 in Blade Length 6 in Blade Thickness 0.09 in Blade Width 1 in Graduation Mark Style Etched Graduation Marks - Front 1/64 in Head Type Square System of Measurement SAE Head Material Steel Head Vial Included Yes Accuracy +/- .0025 in Blade Coating Chrome Features Reversible Lock Bolt Graduation Color Black Graduation Scale 4R Graduation Units Millimeters