Sealtite Kwikseal Woodbinder screws are self-drilling screws designed to attach long-life metal roofing & siding on post-frame & residential metal roof applications. 304 Stainless Steel cupped head & washer provide lifetime protection in the harshest environments. The 304 SS Woodbinder screws are an excellent choice for use in animal confinement applications or for aluminum liner panel applications. Type A point necessitates a pre-drilled hole in steel, but not aluminum. A high quality EPDM sealing washer provides a reliable seal with no leaks every time.