Excerpt from page 3 - Fasteners
When considering what type of screws to use, focus on the galvanized, brass, stainless-steel, or zinc-coated varieties. Stainless-steel drywall screws have a Phillips head an are easily driven by a power drill fitted with a Phillips-head driver. These screws won't corrode or rust, but they are expensive.
Bits used to drill pilot holes should be of the same diameter as the solid part of the screw (that is, minus the threads). Drill pilot holes for all screws. If a screw is countersunk close to a board's edge, the wood is likely to split; predrilling the holes prevents this. Should the wood split, turn over the board or cut a replacement piece.
If the screws show on your final piece, pay close attention to their placement. Screw heads should create a consistent pattern. For the slats, recess the screws 3/8" (1cm) from the sawed ends and use two screws per end.
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