SPAX T-STARplusFlat Head 304 Stainless Steel screws are the ideal multi-purpose decking and construction fastener tooffer corrosion resistance for wood decking, railing, fencing, and other outdoor wood projectsnear fresh water to prevent staining. When premium corrosion resistance is desired, SPAX 304 stainless steel is the best exterior screw option. T-STARplusdrive provides superior bit engagement over Phillips and square drive screws.