Discover the Tek Roofing Screws with Hex Head and Sealing Washer, designed to secure timber effortlessly! These self-drilling screws feature an 8mm hexagonal head and a 5.5mm thread diameter, ensuring a robust hold. Each screw comes with an EPDM bonded sealing washer for superior weather and water resistance, providing long-lasting durability in outdoor applications. Available in lengths of 20mm, 35mm, and 50mm, these zinc-plated screws promise an efficient installation with maximum drilling capability up to 5mm. Ideal for your roofing and construction projects, trust DIYUK for quality and reliability. Elevate your projects today!.