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Reciprocating saws are indispensable for demolition work. They save time, and for some cuts they're the most practical power tool on the job site. Years ago, however, the usefulness of a recip saw was limited by the short service life and cutting capability of the blades. Most early blades were made of highcarbon steel, approximately .035-inch thick, hardened to about Rockwell 65. These inexpensive blades could perform general cutting tasks, but there was a tradeoff between flexibility and durability. Steel that could be sufficiently hardened to provide a good cutting edge lacked the tensile strength and flexibility that would allow it to hold up under severe use, like cutting nail-embedded wood. To improve performance, engineers were faced