Forgefix TFHW16CPSD55125H TechFast Composite Panels to Steel Hex Screw No.5 Tip 5.5 x 125mm Box 100. These screws are designed to join composite panels to steel frame buildings. They feature a specially designed compression control thread to prevent damage and denting of panels. The screws are fire and corrosion resistant, protected by an Elementech corrosion resistant coating, and have been salt spray tested to 1000 hours. They comply with EU Safety, Health and Environmental requirements and are supplied with 16mm EPDM rubber washers. Specifications: Size: 5.5 x 125mm, Insulation Thickness: 32-90mm, Pack Size: 100, Drill Tip: No.5. The No.5 drill tip is suitable for self-drilling in heavy gauge steel up to 12.5mm.