I have be do p90x for almost two year now ... -lrb- more for maintenance now -rrb- ... and thus I have a bunch of dumbbell of the free plate screw on variety -lrb- so I can adjust the weight on my set and also have many different weight ready to go for workout -rrb- . most rack seem to reference molded dumbbell more than the kind I have so I be a little nervous as to whether this would really work for mine -lrb- not see any review discuss my style of dumbbell explicitly -rrb- . the product description say this rack will work for all type but still I be not 100 % confident thing would work and fear find the weight would just miss the spacing this rack give for they . well ... it do work ... perfectly . it be so much better than have the weight on the floor or on the couch as I have be do in recent year . I should have buy this rack a few year ago ! it be a breeze to set up , basically 5 minute plus the time it take to screw in 12 bolt -lrb- which do take a little longer than you would think it would , but be certainly a reasonable amount of time -rrb- . the assembly could be do with no instruction because it be as straightforward as it get . the shipping box get a good beating from UPS during delivery -lrb- include some hole in the box and some patchwork taping ... it look like it go through a war zone ... but the product itself be in great shape with no ding or scratch -rrb- . as someone else point out the bolt and nut seem to now be shrinkwrap to a piece of cardboard so that the piece stay together and there would be little risk of this hardware be lose even with careless shipping -lrb- as UPS seem to provide in my case -rrb- . the rack itself be very sturdy and rugged and look quite sharp ... I do not know why anyone would want to pay for one of the other rack that cost $ 100 or so more as they could not possibly be better . this be everything you need in a dumbbell rack .