The 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. Their self-sealing neoprene washers provide a waterproof seal and a premium finish. Install with a standard screw gun and a 1/4 in. hex drive bit.