From Forgefix
Features/Benefits Elementech 400 surface coating provides corrosion resistance. Salt spray tested to 400 hours. A Non-Cr, Cr3+, yellow/zinc plated surface is environmentally friendly. Lasts up to 6 times longer than standard zinc screw protective coating. Double cutting point reduces splitting and drive time. Capable of penetrating 0.8mm steel. Serrated cutting reduces torque for a faster firmer fix. Improved pull out provided by a serrated cutting thread. Reinforced countersunk neck provides holding power. Improved countersinking from 6 angled lobes. Anti friction prevents jacking, rotation and splitting. Suitable for interior use.