Contractor-Grade Combo Square, 6-In.Little tool, big results. Johnson's easy to use 6" combination square gives you the accuracy and precision you need for every job. Its stainless steel blade has english graduations of 1 8", 1 16" and 1 32" as well as metric graduations that are permanently stamped, so you'll never worry about them fading or wearing. It features a durable acrylic vial, heavy duty cast zinc head with a black, chip resistant e coating finish, and hardened screw in