Big box of 3 1/2" screwsDesigned for use with treated lumber Unique thread design enables installation without predrilling Underhead nibs cleanly and securely lock into wood Everbilt high performance exterior wood screws are designed for wood construction and outdoor projects. Unique thread design features ensure a fast start without the need to pre drill. The spiral shank enables smooth installation and the underhead nibs provide a clean, flush finish. These screws are