Pro-Style

Pro style dumbbells are so named because they are often found in commercial gyms. They consist of weight plates attached to a bar semi-permanently.

See our article Hex vs Rubber vs Pro Style Dumbbells.

Pro style dumbbells are commonly found in commercial gyms. They are made using solid steel handles and standard "pancake" style weight plates. They differ from standard adjustable dumbbells in that the handle ends are a precise length to fit an exact number of plates, it's bolted together so as to be semi-permanent, and they usually have end caps to further smooth out the edges. The bolt is usually difficult to remove and might require sticking a long arm on an allen wrench to give it enough torque to loosen. Manufacturers like to over-tighten the bolt to prevent any chance of loosening accidentally. But the bolt is long, so you have plenty of time to re-tighten it before it becomes a safety issue.

Pro style dumbbells have a larger up-front cost. The maintenance cost is where the savings comes in. When something breaks, you only need to replace the one piece, whether it's a chipped plate or a bent handle from someone dropping it, instead of buying another whole heavy dumbbell plus high shipping costs. It isn't even necessary to buy the same brand of parts. Pretty much all brands are interchangeable. The look and knurling of the handles may be different, but you can usually get away with that even in a nice commercial facility without your facility look cheap, as long as each pair matches. The weight plates are simply standard plates that are also commonly used for adjustable dumbbell handles and standard barbell weight sets, so they're easy to find.

The standard look of pro style dumbbells makes it easy to add more later without worrying much about getting all the same brand for them to look alike. Pro style dumbbells go up to 150lbs or higher, making them often the only choice for dumbbells of the highest weights.