These Forgefix TechFast Hex Head Roofing Screws are designed for fixing cladding and sheet steel to heavy section steel purlins of between 6.0mm and 12.5mm. The screws have a hex head are self-drilling and have a rubber washer which expands under pressure to form a permanent weather seal. They are zinc plated and have an 'Elementech' coating for superior corrosion resistance which has been salt spray tested to 1 000 hours.The TFHH5535 TechFast Hex Head Roofing Screws have the following specifications: Size: 5.5 x 35mm.Pack quantity: 100.PTDFORTFHH5535
