Manual-Reading Protractor Manual Reading Protractor Range 0 Degrees to 180 Degrees Graduations 1 Degrees Accuracy +/-0.3 Degrees Material Steel Blade Length 19 45/64 in Operation Type Mechanical Blade Thickness 1.18 in Finish Satin Chrome Head Length 26 9/16 in Head Shape Semi-Circular Includes Clamping Screw Plastic Case Magnetic Head Yes