General description Forgefix TechFast Roofing Sheet to Steel Heavy-Duty Screws are designed for securely joining metal roofing panels to steel frame buildings. These screws are fire resistant and corrosion resistant, ensuring durability and reliability in various conditions. Technical specifications Size: 5.5 x 70mm Effective Thread Length: 51mm Head Type: 8mm Hex Pack Size: 100 Drill Tip: No.5 for self-drilling in heavy gauge steel up to 12.5mm Other information Protected by Elementech corrosion resistant coating, salt spray tested to 1000 hours Supplied without washer MPN: TFHUWSD5570H EAN: 5028485195078