These Forgefix Cavity Wall Anchors are a specialist plasterboard fixing with Pozi compatible and slotted combination drive insert They have an all-metal construction for applications which require heat resistance and are Zinc Plated for increased resistance to corrosion The anchors have anti-rotation teeth which pierce the base plasterboard skin to ensure firm anchorage APPLICATION All metal construction means the anchors are suitable for the heavier duty tasks such as fixing radiators and wall units Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged Zinc oxide is a fine white dust that in contrast to iron oxide does not trigger a breakdown of the substrate’s surface integrity as it is formed The zinc oxide if left intact can act as a barrier to further oxidation in a way similar to the protection afforded to aluminum and stainless steels by their oxide layers