[#17 Replacement Screws] - #17 Diameter Screw is perfect for replacing old and backed out metal roofing screws. - Oversized diameter ensures a proper seal even after replacing screws up to #14 in size. - Wallowed-out screw holes are not an issue when using an oversized #17 screw. [Long-Life ZXL Dome Cap] - ZXL Dome Cap completely covers the EPDM washer - Prevents UV damage and cracking washers over long periods of time. - Dome Cap ensures the washer lasts years longer than an industry-standard exposed washer. [Prevents Red-Rust] - Zinc/Aluminum Alloy head prevents red rust from ever starting. - Molded head with long-life coating means no red rust. [Sharp Tip] - Type AB thread form is designed to provide maximum pull-out strength. - Made specifically for attaching steel panels. - Sharp drill edges consistently cut the metal, eliminating slow or dropped screws and pigtails that can embed themselves in the rubber washer. [Simple and Easy Installation] - 5/16" Hex Head - 250-Count Bags - EPDM Washer - Can be installed by anyone, regardless of experience. - Each order includes a 5/16" magnetic hex bit driver, making installation even easier! #17 x 1" Long-Life Dome Cap Metal Roofing 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 opr 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. Type AB thread form is perfect for metal-to-metal applications, and the sharp drill edges consistently cut the metal. 250-Count bag with included 5/16" magentic hex bit driver makes the job simple and easy!