These Forgefix Masonry Anchors are Zinc Yellow Passivated for increased durability and corrosion resistance. They have a tough and reliable construction to cover most heavy-duty fixing applications. The four way expansion shield offers extremely strong and secure anchorage, and the specially manufactured retaining spring ensures encapsulation of the wedge during expansion. APPLICATIONIdeal for fixing racking, machinery, trunking, pipework, switch gear and other applications.Ensure the correct socket drive or spanner is used to ensure accurate installation. The Zinc Yellow Passivation process of electroplating is similar to the Galvanised and Zinc Plated processes but with the addition of a yellow dye. It provides a coating that is aesthetically pleasing, and which offers excellent resistance to corrosion.