Discovery t-squares have hard tempered aluminum blades securely riveted to a super rugged plastic or steel t-head. Both t-heads possess high impact strength, and the steel t-heads are strong enough to cut against.
12 in. through 48 in. t-squares feature both metric and empirical graduations etched into the aluminum blades for permanence and accuracy. The 60 in. t-square has acid-etched empirical graduations only.
