The Ironmaster QuickLock will be a good pick for you if you want to get a pair of dumbbells with a very wide range of weights, perhaps for multiple people with different levels of fitness. But you have to be prepared to pay over $350.
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Pro Very wide weight range
Out of the box, the dumbbells can be adjusted from 5 to 45-pounds, but you can expand this range up to 120 pounds with extra add-ons with a total cost of $161.00.
Pro Lifetime warranty
If something happens with your dumbbells at any time, you can return them for a refund or get a replacement.
Pro They are very durable
The dumbbells are made entirely from steel. They can easily survive being thrown on the ground.
Pro Changing weights is quick
These dumbbells have a unique patented lock that lets you add or remove weights in under 15 seconds and then securely fasten them.
Con They're very expensive
For some, such simple piece of fitness equipment as a pair dumbbells that costs nearly $400 (and above) may seem unreasonable. If you're only starting to work out you can easily find much more affordable options.
Con Only sold in pairs
You can't buy one dumbbell separately, which for some people is more convenient because it's cheaper and requires less space.