The sliding blade is adjustable making it more practical for a wide variety of uses than a regular square with fixed blade. The faces of the head are ground perfectly square. The hardened steel precision rule has a brushed steel finish and machine-divided graduations in 1/8" and 1/16" on one side and 1/32" and 1/64" on the other side. Made in USA by The L.S. Starrett Company.
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