Metal Construction Timber to Heavy Section Screws - Countersunk - Wing-Tip - Self-Drilling - Zinc When the wings hit the

When the wings hit the metal they will break off to permit the thread to self-tap into the metal

Mainly used in soft timber applications or masonry with a plastic plug

without burning out

A traditional twin-thread woodscrew with single lead start for a fast installation

Metal Construction Timber to Heavy Section Screws - Countersunk - Wing-Tip - Self-Drilling - Zinc When the wings hit theSpecifically designed to attach wood 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.