From Forgefix
Features/Benefits Annular Ring Shank. Finish: Zinc Yellow Passivated. Annular ring shank for supreme holding power. Absorbs movement when expanding and contracting in varying internal type of heat. Large head distributes the load directly underneath the top of the nail. Plasterboard stays firm and secure. Zinc yellow passivated for increased durability. Suitable for fixing plasterboard and cladding.