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Intro: When a Phillips Is Not a Phillips! Cross-head, Cross-Point, Cruciform, Square Drive Screws and Drivers These screw types have a + shaped recess on the head and are driven by a cross-head screwdriver, designed originally ... Step 1: Early Screws.
At least in manual models, the power comes from whoever is twisting the tool, and that twisting happens from the handle. The vast majority of screwdriver handles are made of wood or plastic, though some are made of steel, brass or aluminum. Still others are made from carbon fiber or a similar polymer.