Forgefix TechFast Composite Panels to Steel Hex Screws provide a robust and reliable fastening solution for joining composite panels to steel. These self-drilling screws feature a No.5 drill tip, ideal for heavy-gauge steel applications. Designed for efficient installation, they are perfect for a variety of construction and DIY projects. Features Self-drilling No.5 drill tip for efficient installation in heavy gauge steel. Suitable for composite panels to steel applications. Designed for use with insulation thicknesses between 37-50mm. Hex head for secure tightening. Supplied in a box of 100 for convenient use. Specifications Brand: ForgeFix MPN: TFHW16CPSD5585H EAN: 5028485195313 Size: 5.5 x 85mm Drill Tip: No.5 Pack Size: 100 Insulation Thickness: 37-50mm Suitable for Steel Thickness: Up to 12.5mm. They are fire and corrosion resistant, protected by Elementech corrosion resistant coating, salt spray tested to 1000 hours. Complies with EU Safety, Health and Environmental requirements. They are supplied with 16mm EPDM rubber washers.