Forgefix TechFast Timber to Steel CSK/Wing Screws are used to join timber to steel frame buildings. The screws are fitted with breakaway wings that create a clearance hole to protect thread from engaging timber when drilling through. Breakaway wings will ream a hole, then break-off when they contact the metal surface to be drilled. The thread will then engage with metal. They have a TORX® compatible insert for a higher transmission of power. With improved countersinking from recessed ribs. Fire and corrosion resistant. Complies with EU Safety, Health and Environmental requirements.Select Option No.3 Tip 4.8 x 38mm Box 200No.3 Tip 5.5 x 100mm Box 100No.3 Tip 5.5 x 110mm Box 50No.3 Tip 5.5 x 120mm Box 50No.3 Tip 5.5 x 150mm Box 50No.3 Tip 5.5 x 40mm Box 100No.3 Tip 5.5 x 50mm Box 100No.3 Tip 5.5 x 60mm Box 100No.3 Tip 5.5 x 65mm Box 100No.3 Tip 5.5 x 80mm Box 100 Add to Basket Quantity