TechFast Roofing Screw - Heavy Section Purlins - Bag (100) - 5.5 x 51mm

• Roofing Screws. Steel to Steel (For Heavy 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 heavy section purlins will fix material to purlins between 6.0mm to 12.5mm.
• 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.