ByZoom Fitness brings a practical solution to the adjustable dumbbell market with the Pure Series 75lb pair. These aren’t the quick-change dial systems you see everywhere. Instead, each handle uses a threaded design that lets you add or remove individual cast iron plates. The result is a set that feels solid in hand, with no wobble or loose parts during a set of rows or presses.

At 75 pounds per dumbbell, these cover serious ground for progressive overload. The plates are dense and compact, so even at max weight the handles don’t feel oversized or awkward. Weight changes take a few seconds per side. It’s slower than a dial system, but the trade-off is a more secure connection and a much lower failure point. The knurling on the handles is moderate—enough grip for heavy lifts without tearing up your palms.

The build is straightforward cast iron with a black finish. No rubber coating to peel or chip over time. One honest note: the threaded collars can be finicky to tighten fully if you’re in a rush. Make sure they’re snug before lifting. For home gym users who want durability over gimmicks, these deliver a reliable, space-saving way to load up heavy without needing a full rack of fixed dumbbells.