Little tool, big results. Johnson’s 12″ metal combination square gives you the accuracy and precision you need for every job and was designed to be durable for a lifetime of use. Its stainless steel blade has graduations of 1/8″, 1/16″ and 1/32″ that are permanently stamped so you’ll never worry about them fading or wearing. Similarly, the durable acrylic vial, heavy-duty cast zinc head with a black, chip-resistant e-coating finish, and hardened screw-in scriber that won’t fall out helps this combo square withstand even the roughest job site abuse. 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.