Little tool, big results. Johnson's easy to use 12" Structo-Cast(TM) combination square gives you the accuracy and precision you need for every job. Its stainless steel blade has english graduations of 1/8", 1/16" and 1/32" that are permanently stamped, so you'll never worry about them wearing or fading. It also features a durable acrylic vial and heavy-duty Structo-Cast(TM) molded reversible head with a lock bolt and steel screw to ensure your measurements are spot-on every time.