Sold as a complete kit (2 pcs, box).
Expand your NÜOBELL 550 Black to a complete 580 set

So what happens when 50 LB feels too little? Expand your existing 550 set to a complete 580 with up to 80 LB on each dumbbell. 
Comes with all the weights and the longer cradles fully assembled to convert your NÜOBELL 550 Black to a NÜOBELL 580 – for much less than you'd pay for a whole new set of 580. 

Easy to make into a 550 again if you want to bring to the country house, the van or to the park training.

Weight range (LB): 55–60–65–70–75–80.
Net Weight: 64 LB  (including cradle)
Product Dimensions: L-19 x H-7.5 x W-7 in

2 year warranty. Residential use only.

Swedish patent, development and customer support.