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Since wood plastic composite decks have many thin planks and must withstand harsh environmental conditions, deck screws are designed to accommodate the challenges of this application. Deck screws must resist corrosion, drive easily, and lay smoothly against the deck surface, called countersinking. For these reasons, many deck screws are self-countersinking, self-drilling, and coated with materials that won’t rust.
Deck screws, like other screws, come in a wide variety of lengths and widths, called shanks. They also use different shapes of driver, the part on the screw head that allows a screwdriver to dig in to the wood and rotate. A popular head shape is a square, because it holds the driver and doesn’t strip as easily as Phillips heads.