Forgefix TechFast Timber to Steel CSKWing 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