General description Forgefix TechFast Composite Panels to Steel Hex Screws are designed for securely joining composite panels to steel frame buildings. These screws feature a specially designed compression control thread that prevents damage and denting of the panels. They come with 19mm EPDM rubber washers for enhanced sealing and protection. Technical specifications Size: 5.5 x 120mm Diameter: 5.5mm Length: 120mm Insulation Thickness: 33-99mm Pack Size: 100 Drill Tip: No.3 for self-drilling in light gauge steel up to 5mm Corrosion Resistance: Elementech corrosion resistant coating, salt spray tested to 1000 hours Other information