These Forgefix single thread Coach Screws are Zinc plated for increased corrosion resistance. Their hex head enables higher torque capability when tightening, & to increase speed of use with socket drivers. Conform to DIN571 standards. APPLICATION: Used widely in heavier timber installations & for fixing timber to masonry. Also popular as a fixing for satellite dish installation together with a rimmed or rimless wall plug. 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 Single thread screws have been designed to offer higher pull out values & quicker insertion. Coach Screw Hexagon Head Single Thread ZP M10 x 100 Box 50