These 5.5 x 25mm hex head self-drilling screws are engineered for roofing applications, offering precision and efficiency. Featuring a 16mm washer, they ensure secure fastening, while the BZP finish provides robust corrosion resistance. Ideal for metal-to-metal connections, these screws simplify installation with their self-drilling capability, reducing the need for pre-drilling. Perfect for both professional and DIY projects, they deliver reliability and durability, ensuring your roofing tasks are completed with ease and confidence.