Teks 12 x 1 in. External Hex Steel Washer Head Drill Point Roofing Screw (80-Pack) provides secure metal to metal fastening with strong holding power without the need to pre-drill. Engineered drill-point and flute remove material efficiently and properly size the hole for threads. Ideal for attaching roofing and wall panels to steel framing. 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 5/16 in. hex drive bit.