TechFast Roofing Screw Timber - Steel Light Section 4.8 x 38mm Pack 100 - ForgeFix TFCL4838, These Forgefix TechFast Roofing Screws are designed for use in joining timber to steel and for light section purlins. They have a Torx compatible, countersunk head to sit flush to the surface. The self-drilling point enables speedy insertion, and the wings create a clearance hole in the timber to eliminate the chance of 'jacking' when fixing. The screws are zinc plated and have an 'Elementech' coating for superior anti-corrosion, which has been salt spray tested to 1,000 hours. These light section roofing screws are suitable for fixing timber to steel thicknesses of 1.5mm to 4mm. Each pack is supplied with a free Torx compatible bit.The TFCL4838 TechFast Roofing Screws have the following specifications: Size: 4.8 x 38mm.Pack quantity: 100. ForgeFix TechFast Roofing Screw Timber - Steel Light Section 4.8 x 38mm Pack 100