The original Swanson Speed Square has been an indispensable tool for tradesmen for nearly a century. Diamond mark and fade-resistant easy-read markings but we've taken it up a notch. To make accurate layouts even easier, there's a scribe bar with guides milled every 1/8 in. Also, drilling holes centered on 3/4 in. stock couldn't be simpler thanks to a hole milled 3/8 in. from the inside edge, right-sized for self-centering drill bits.