Little tool, big results. Johnson's easy to use 12" metal combination square gives you the accuracy and precision you needfor every job. Its stainless steel blade has English graduations of 1/8", 1/16" and 1/32" as well as metric graduations that arepermanently etched in black for easy readability. 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 eventhe roughest job site abuse. It was also designed with maximum accuracy in mind - its square head is CNC machined forgreater accuracy, and the Auto-Lock blade assembly makes it easier to accurately line up your tool for use. A necessary tool for any tradesman, this combination square is handy for any number of different project and tool-setupapplications from woodworking, to stonemasonry to metalworking. Because the highly accurate CNC-machined head acts asa stop, it guarantees your layout lines are always square to the edges, making it ideal as a machinist's square, astraightedge, an adjustable try square, a mitre square, a marking gauge and a depth gauge.