DeckWise Heat-Treated Stainless Steel deck screws are specially engineered, four-sided tips and a serrated thread design to minimize board splitting or splintering, even when drilling near the edge. The line of Heat-Treated Stainless Steel deck screws we offer are an 18-8 heat treated screw for hardened toughness and feature a patented TTAP T15 Star Drive head with locking bit. Meaning, less stripping, less snapping and less headaches when installing hidden deck fasteners, hidden siding fasteners or face screwing. Engineered exclusively by DeckWise, they make installations easier than ever.