For centuries, the steel square has been a mainstay in the toolbox of skilled craftsmen. In the hands of someone who knows how to use it, this simple tool can quickly solve many common construction problems involving angles, arcs, circles, and squares. With the help of the Essential Guide to the Steel Square, anyone can unlock the helpful secrets of this valuable, time-honored tool. Packed with hundreds of clear illustrations and diagrams, skill-building exercises, and simple rules of thumb, this handy reference will show any curious carpenter, woodworker, or serious do-it-yourselfer how indispensable the steel square can be in building stairs, roofs, rafters, and practically anything else. No batteries are required--your steel square can solve many problems that your smart phone can't!