TechFast Roof Screw Hex/Washer Per 50 S/D Light Duty 5.5x70

• Roofing Screws. Steel to Steel (For Light Section Purlins).
• Washered Self-Driller. Steel Sheet to Steel Purlin.
• Head: Hexagon Self-Drilling.
• Finish: 'Elementech' coating for superior anti-corrosion - salt spray tested to 1000 hours.
• TechFast screws for light section purlins will fix material to purlins between 1.2mm to 3.6mm.
• The 16mm rubber washer beneath the aluminium flange expands under pressure and forms a permanent weather-seal.
• Designed for fixing cladding and sheet metal to light and heavy structural purlins as used when constructing industrial units.