Heavy Duty CSK Wing-Tip Self-Drilling Screws Zinc 5.5mm x 65mm 200 Pack

Specifically designed to attach timber to heavy section steel (Max. 12mm). Metric thread with wings designed to ream out the timber, so the screw can achieve Max. R.P.M. without burning out. When the wings hit the metal they will break off to permit the thread to self-tap into the metal.

Also suitable for other sheet materials such as fibre cement in wall and floor applications when fixing to SFS framing or steel purlins.