Teks 9 x 1-1/2 in. Zinc-Plated Steel Hex-Washer-Head Roofing Screws (100-Pack) provide secure metal-to-wood fastening and strong holding power without pre-drilling. The sharp self-piercing point is ideal for fastening corrugated roofing panels to wood structures. A self-sealing EPDM washer provides a waterproof seal and a premium finish provides exceptional corrosion resistance in harsh outdoor environments. Installs with a standard screw gun and a 1/4 in. hex drive bit.