TECHFAST HEX ROOF SCREWS 5.5X40MM TIMBER TO STEEL 100 HEAVY

TechFast Timber to Steel.
Used for joining Timber to steel frame buildings.
No.5 drill tip for self-drilling heavy gauge steel up to 12.5mm.
Screw 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. Thread will then engage with metal.
Torx compatible insert for a higher transmission of power.
Improved countersinking from recessed ribs.
Fire and corrosion resistant, protected by Elementech corrosion resistant coating, salt spray tested to 1000 hours.
Complies with EU Safety, Health and Environmental requirements.