This 12G screw is approximately 5.5mm in diameter and 50mm in length. The top-lock hex head incorporates an anti-loosening feature that resists vibration, ensuring a secure, maintenance-free hold. Class 4 galvanisation offers exceptional long-term corrosion protection, making it ideal for severe external environments and structural applications exposed to weather or coastal conditions. Type 17 point features a cutting flute for fast, clean starts in timber, reducing the risk of splitting.Reliable fixing into timber with strong grip and smooth drive for professional results.Buildex® Roofing Screws are designed to meet the demands of a wide variety of roofing applications. Engineered for strength, security, and durability, they perform reliably in everything from temperate to cyclonic conditions.This product comes as a pack of 1000 screws.