Little tool, big results. Johnson's easy to use 12in combination square gives you the accuracy and precision you need for every job. Its stainless-steel blade has graduations in 1/8in, 1/16in and 1/32in that are permanently stamped, so you'll never worry about them fading or wearing. It features a durable acrylic vial and heavy duty cast zinc head with a black, chip-resistant e-coating finish. The hardened screw-in scriber stays securely in place, built to endure the toughest job site conditions. It was also designed with maximum accuracy in mind - its square head is CNC machined for greater accuracy, and the Auto-Lock blade assembly makes it easier to accurately line up your tool for use.