Tool Shop® 12-inch combination square features a hardened stainless steel blade with permanent stamped graduations in 1/8, 1/16 and 1/32-inch. The blade has a rust-preventative coating for long life. It comes with a convenient level vial in the head. The heavy-duty precision molded plastic square head is ideal for measuring, marking and layout out of either 90 or 45-degree angles or to check depth. Hold the 90-degree edge of head against board and use steel blade as a cutting guide.