The power block u90 rack stand this stand is specifically for use with the power block u 50 or u 90 urethane sets keep your dumbbells safe with the power block u90 rack stand this stand has adder weights storage ports that come very useful if the adder weights are not in the handle of the weights themselves compatible with the following product power block flex urethane series u90 dumbbells please note power block u90 dumbbell set not included key features of the power block u90 rack stand