Power Pro® TimberTite® Structural Wood Screws are general-purpose, heavy-duty fasteners designed for wood-to-wood construction without pre-drilling. Power Pro® TimberTite® Structural Wood Screws are ideal for a variety of projects both indoors and outdoors to use in place of standard lag screws. With a proprietary corrosion resistant coating that is compliant with ACQ and other forms of treated lumber. Power Pro® TimberTite® Structural Wood Screws have a hex drive and a built-in washer for one-step fastening.