{Self-Drilling #14 ZXL Metal Building Screws} - Self-Drilling tip means no pre-drilling. - Easily penetrates steel up to .210" thickness with no "point-walking". - Will securely fasten panel side laps up to 16 ga. panel thickness with no strip-out when installed correctly. [Dome Cap] - ZXL Dome Cap completely encapsulates the EPDM washer. - Provides a tight seal on the washer that prevents UV damage from occurring over time. - Protecting the washer from the sun guarantees to reduce cracking. - 40-year guarantee when installed correctly. - Dome cap screws are guaranteed to last years longer than industry standard exposed washer screws. [Multiple Colors] - With 17 different color options to choose from, we're sure to have the right color you're looking for. - Each painted option is painted with a powder-coating system. - Each hex head is coated with a zinc/aluminum alloy that prevents red rust from ever starting. {Easy to Install} - Can be installed by anyone, regardless of experience. - All orders include a magnetic 5/16" Hex Driver. - Advanced forging process technology - Sharp drill edges consistently cut the metal, eliminating slow or dropped screws and pigtails that can embed themselves in the rubber washer. [The Perfect Finishing Touch] - 1.25" in length. - EPDM washer. - Dome Cap Hex Head. - The perfect finishing touch for your metal roof! #14 x 1.25" Long-Life Dome Cap Metal Building Screws are the perfect replacement screw that will last for years to come. With an oversized diameter and a 5/16" hex head, replacing old or backed-out screws is easy. The dome cap completely covers the EPDM washer, protecting it from UV damage and preventing cracking over time. Zinc/Aluminum alloy head prevents red rust. Self-Drilling tip is perfect for metal-to-metal applications, securing fastening 2 layers of 26-gauge steel with no strip-out. 250-Count bag with included 5/16" magnetic hex bit driver makes the job simple and easy!