Fasteners for a lasting, firm hold
Shank size: Shank size affects a screw's sheer strength and pull-out power. A wider shank means the screw threads can be more aggressive. In general, use #10 screws for heavy-duty projects, such as deck building, and #7 or #8 for lighter-duty tasks, such as outdoor furniture construction.
Shank slot: Look for screws with a shank slot like those shown. This feature improves a screw's ability to auger into a hole, improving self-tapping capability without having to predrill.
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