The Magnetic Combination Square hand tool features a magnetic locking system and durable, quality construction. The tool is a professional-grade tool, suitable for a variety of applications including carpentry, general construction and remodeling, woodworking, and do-it-yourself projects. Unique to the design is a smooth-sliding head and patented adjustable magnetic locking system that features a rare earth magnet. Featuring hardened, cast-zinc construction, the body is rugged and corrosion-resistant. The 12-inch reversible ruler is durable stainless-steel, and finished with easy-to-read graduations in both 1/16- and 1/32-inch increments. For enhanced accuracy, the square is machined on five sides, and all edges are milled. A magnetically-held hardened scribe and reference vial are also included.