The Stanley contractor grade combination square is a multipurpose tool that provides you with a square for English measurements, a level vial, and a scratch awl. The 12 In. square has precision-machined working surfaces for improved accuracy; the hard chrome-plated blades are deeply etched and coated for rust resistance for long-term use and readability. The handle is made of durable die-cast metal in high-visibility yellow and features solid brass knobs which are textured for easy adjustments. The easy-to-read level vial is individually regulated to ensure accuracy. The design features inside and outside try square and a built-in scriber for convenient surface marking. This product is backed by a lifetime limited warranty.