Starrett 20-6 Hardened Steel Master Precision Square, 4-5/16" Beam Length, 6" Blade Length

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Precision square corners, tool steel, hardened and precision ground, lapped beams and blades, external dimensions 6 x 4 5/16 squareness 0.0001, wooden beams and blades are hardened, ground and lapped to ensure parallelism and trouble-free locksmith's hammer squaresused in visual checking of parts for squareness and to position an element perpendicular to the other. True 90 angle inside and out. Beams and blades are lapped for straightness and parallelism. Blade length is measured from inner edge beam to end of blade.