I buy this item seperately from the dumbbell . the dumbbell be fantastic and so be this item ... once you get it together . the instruction be really poor ... could be ton better . however , once you study the diagram it be relatively easy to get together . once it be together it be invaluable for hold the dumbbell . Perfect height and fit . I use the rolling caster so I can move they . they have lock on the wheel to keep they stationary and work very well . all in all , definitely worth the puchase . just do not expect much from the instruction .