The combination square from BORA, a  division of Affinity Tool Works, is ideal for joint layout, machine setup/checking, and level/plumb determination, and can also be used as a height, depth or marking gauge. The square features a smooth-sliding head and patented adjustable magnetic locking system for fast, precise alignment. A hardened scriber and level are included with a stainless-steel 12-inch reversible ruler with easy-to-read graduations.