The advantages and properties of the internationally exclusive SPAX YELLOX surface at a glance:YELLOX achieves corrosion protection that is more than 6 times greater than that offered by blue zinc plating at the same surface thickness (layer thickness of 46 m with artificial atmospheric corrosion)|YELLOX is free of chrome(VI) and thus far more environmentally-friendly than conventional surfaces, both during manufacturing and usage|With YELLOX, the screw retains its yellow appearance with the benefit of higher corrosion protection