5.5 x 85mm Self Drill Phillips Countersunk Wing-Tip Screw – Metal Construction Timber to Heavy Section Steel – (Bi-Metal Exterior)

Specifically designed to attach wood to metal (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.

• Hardened carbon steel drill tip fused on to an A2-304 Austenitic Stainless Steel body