Cartridge Nails Zinc Plated that are Hardened and Washered with a Zinc Plated finish. Manufactured from austempered (heat treated) high carbon steel. Designed specifically for use with the DX450 cartridge nail machines. Fitted washer prevents fixtures pulling over the head of the nail. Zinc plated for increased durability. Used for fastening trunking, cabling, steel channelling, plastic sheeting, cable trays and timber form work in masonry applications.