These Forgefix Screw Eyes are Zinc Plated for increased resistance to corrosion. They simply screw directly into timber and similar materials. Drilling a pilot hole is advisable. The screws are also suitable for use with all types of wall plugs. APPLICATIONScrew Eyes are used to attach cables, wires and twine to numerous applications. 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 substrates 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. Screw Eyes ZP 55 x 12g Bag 10 Forgefix Screw Eyes Zp 55 X 12G Bag 10 in Silver