These Forgefix Set Screws are made from grade 8.8 steel & are zinc plated for increased resistance to corrosion. They are fully threaded & conform to DIN 933 standards. Can be used with many Nut types & Washers. APPLICATION: For fastening together numerous types of material or to be fastened in to pre-tapped holes. Widely used in many engineering applications. Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier & 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&8217;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 & stainless steels by their oxide layers. High Tensile Set Screw ZP M6 x 25 Box 100