Simpson Strong Tie #9 x 2 1 2 in. 1 4 Hex Drive, Strong Drive SD Connector Screw (500 Pack) Vinyl End Post Six 3 prong grounded outlets for Six 3 prong grounded outlets for use with outdoor devices Interruption free programming headlights Highly sustainable Environmental Friendly 1 Year Limited Manufacturing Defects Warranty Made in the United States Helps keep your floor clean by removing dirt and debris from shoes These durable mats have an innovative scraping surface that cleans shoes while hiding dirt in recessed channels The slip resistant surface repels water this screw is designed for both interior and exterior applications A: They are compatible with both interior and treated wood