Cast Iron Dumbbell Set 27.5 kg with Spring CollarsCast Iron Dumbbell Set with Spring Collars 27. 5 kg This set, consisting of two dumbbell bars and 12 powder coated weight plates made of solid cast iron with a total weight of 27. 5 kg, is practical and safe to use: the dumbbell bars have a ribbed grip surface and the weights can be securely fastened with the included spring locks perfect for training without a partner! In addition, the set offers an enormous range of possible exercises, especially