30-531-8 Steel Square 18"Steel Square Features include 18" Blade Length 10" Beam Length 0. 0020" Squareness 0. 0013" Parallelism Made from high quality tool steel, these square have true right angles inside and outside. The beams and blades are precision ground, the blade is hardened, and the length of the blade is measured from the inner edge of the beam.
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