General description Forgefix TechFast Roofing Sheets to Steel Hex Screws are designed for securely joining metal roofing panels to steel frame buildings. These screws feature a No.5 drill tip for self-drilling in heavy gauge steel up to 12.5mm, making them ideal for various roofing applications. Technical specifications Size: 5.5 x 70mm Effective Thread Length: 47mm Pack Size: 100 Drill Tip: No.5 Fire resistant and corrosion resistant Protected by Elementech corrosion resistant coating, salt spray tested to 1000 hours Compatibility and accessories Supplied with 16mm EPDM rubber washers Other information MPN: TFHW16SD5570H EAN: 5028485195856