Full 304 Stainless steel fasteners offer protection in high-corrosion areas and for panel installations within 3000 ft of salt water. The fused 304 Bi-Metal self-drilling point series offers the same corrosion resistance of austenitic 304 stainless steel with the added advantage of not having to pre-drill the fastener. Head and shank on the 304 Bi-Metal series has a 25-year warranty against red rust. Hex drives in 5/16” or 3/8” depending on size. LSC spring clip drivers are recommended. Some styles available painted to match metal panel color.