Safety Structure: Double safety buckles on the tray and handle bar make this adjustable weight dumbbells pair can only be adjusted on the tray, the non-slip design at the handle ensures safety and stability during exercise after the dumbbell leave the tray 1 Second Weight Change: Turn the handle with single hand to quickly adjust to the required weight from 5 lb to 25 lb. There will be a corresponding pointer and a click sound to let you know that the adjustment is complete, which is super easy to use Space Saving: You only need a single dumbbell, you can have multiple sets of dumbbell training experiences. The weight can be adjusted according to your own level, making it ideal for small spaces and home workouts. This cleverly designed adjustable dumbbell meets the needs of practitioners, professional weight trainers and fitness enthusiasts Exercise Essentials: The multi-weight one-piece design of this quick adjustable dumbbell set is very suitable for specific parts