Simpson Stainless Steel Fascia Screws are specifically designed to fasten both Composite and PVC fascia boards. The composite fascia screws are made with type 316 stainless steel to provide superior corrosion resistance. The fascia screw is designed to secure fascia material firmly in place while allowing the composite boards and PVC boards to expand and contract with environmental changes. A professional installation with the Simpson Strong-Tie FSBIT Fascia Screw Countersink Bit (sold separately) prevents head pullover, broken screws, warping, buckling, and oil-canning from occurring. Available in 12 colors to match major brands' fascia material.