Forgefix masonry nail heavy gauge zp forgefix mn3550 these forgefix masonry nails are heavy gauge universal nails suitable for fastening all manner of fixtures in place on masonry applications the nails are manufactured from austempered heat treated high carbon steel for strength and durability and are zinc plated for increased resistance to corrosion for fastening cabling timber form work etc to concrete and masonry always wear suitable eye protection to the recommended standards