For a lag screw alternative that will stand up to even the harshest elements but doesn't require pre-drilling, choose PHEINOX RSS Stainless Steel Screws from GRK. They're made of hardened 305-grade stainless steel and are perfect for connecting posts to a deck. Among the unique features of the Pheinox RSS is its built-in washer head that doesn't have sharp edges plus a six-threaded CEE thread that reduces the likelihood of splitting because it enlarges the screw hole. For incredible drawing strength and no chance of rust, try Pheinox RSS Stainless Steel Screws.