Little tool, big results. Johnson's 12 in 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 in, 1/16 in and 1/32 in 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.