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JLC ??APRIL 1991 CHOOSING STEEL TOOLS Next to wood, steel is the most ubiquitous material on a construction site. From saw blades and chisels to hammers and an assortment of nail pullers and screwdrivers, steel dangles from every tool belt. At first glance, all that steel seems to be about the same — cold, hard, and rusty. But like the tools themselves, the steel used for each implement is designed to do a specific job. For instance, the kind of steel needed to make a quality hammer would not be the best choice of material for the tooth of a saw blade. And likewise, the tungsten carbide that seemingly holds its edge forever on a saw blade would be a disaster (and an expensive