Combination Square, Number of Pieces 2, Blade Finish Brushed, Blade Material Steel, Head Length 4 1/2 in, Head Width 3/4 in, Blade Length 4 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 Cast Iron, Head Vial Included Yes, Accuracy +/- .0025 in, Features Reversible Lock Bolt, Graduation Color Black, Graduation Scale 4R, Graduation Units Inches, Millimeters, Head Color Black