Product Description Little tool, big results. Johnson's easy to use 16" combination square gives you the accuracy and precision you need for every job. Its stainless steel blade has English graduations of 1/8” and 1/16” as well as metric graduations that are permanently stamped, so you’ll never need to 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 scriber that won't fall out so that this combo square can withstand even the roughest job site abuse. It was also designed with maximum accuracy in mind - its Auto-Lock™ blade assembly makes it easier to accurately line up your tool for use. From the Manufacturer Cast zinc head with computer-machined gauging edges for greater accuracy. Acrylic yellow barrel vial. Hardened, removable scriber. Steel blade with protective anti-rust coating is permanently stamped in 1/8ths, 1/16ths, 1/32nds and mm.