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any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to shaping tools, include such implements as the hammer for nailing and the vise for holding. A craftsman may also use instruments that facilitate accurate measurements: the rule, divider, square, and others. Power tools-usually hand-held, motor-powered implements such as the electric drill or electric saw-perform many of the old manual operations and as such may be considered hand tools.