I get this yesterday for my  bowflex selecttech 552 adjustable dumbbell -lrb- pair -rrb-  after find that Bowflex 's instruction be too skim , I go to the instruction on Amazon.com instead , because they be more descriptive . for the most part , the assembly be straight forward , but tighten the nut and bolt be rather painful . I be use a adjustable wrench , along with the allen wrench they provide , but I would imagine that assembly would be a lot smoother if I have own a ratchet wrench . after assembly , I absolutely love the stand . however , I give four star just because the assembly take a bit too long . I highly recommend this product and a good ratchet wrench .