A screwdriver bit is a detachable tip or toolhead used to drive screws, typically fitted into a hand-operated screwdriver, a drill or an impact driver. Interchangeable bits let a single handle or power tool work with many different screw types and sizes, and they are among the most common accessories in hand and power tool systems, used across construction, electronics, automotive repair and woodworking. The concept of an interchangeable driving bit has existed since at least the early twentieth century.
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