Screwdriver bits, which are interchangeable and detachable parts made to fit into the chuck end of screwdrivers, are a very common part of almost every toolbox. Standard and impact screwdriver bits are made of S2 hardened steel and are intended for professional usage in power drivers. Depending on your demands, screwdriver bits come in Phillips Drive, Square Drive, Torx Drive, PoziDrive, and Hex Drive.
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