ForgeFix Mirror Screw Chrome Domed Top Slotted CSK ST ZP - ForgeFix 10MS112CP, These Forgefix Mirror Screws are zinc plated for resistance to corrosion, and have a slotted screw head and a threaded female insert in the head and shank. They have a chrome plated dome with a threaded machine screw type male insert, and screw-in top. Often used when fixing mirrors or signage, the single threaded screws will hold firm in wall plugs. Suitable for use when fixing mirrors or signage in sanitary and similar locations. 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 aluminium and stainless st