HEAD TYPE & RECESS TYPE
Screw type fasteners are manufactured with different head styles. Sometimes the style serves a functional purpose, and sometimes it's more decorative in nature. Understanding the differences will help you decide which style to choose.
Drive style—or drive recess as it is called—refers to the kind of tool you use to adapt it for engagement by a driver for turning the screw axially to force it or remove it from the workpiece. Of the many that exist, the most common are: Slotted, Phillips, Hex, Hex Socket, Square, Torx® and Pozi. Sometimes features are combined, as in the case of Phillips Slotted Combo, Pozi Slotted Combo, Phillips Square Combo designs.
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