Uni-clip casting : The uni-clips are made from iron casting, they can reach required tensile strength, plain and hot-dip galv. Dogspike ... ,ANSI,BSW,AS,JS,ISO,ETC.finishbright,zinc plated,hot-dip galvanized,mechanical plated ,nickel plated,blackgrades4.8,5.8,6 ... threaded rods. If any questions ,kindly let us know. Uni-clip castings