This set includes a Speed trim square and Speed square. 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. The Speed square combines five tools into one, including a try square, miter square, saw guide, line scriber, and protractor. The Speed square is die-cast for durability and accuracy. Made of heavy-gauge aerospace aluminum alloy, it is built to last. Black-filled gradations stand out against a matte finish for easy reading.