Transformable for All Fitness Levels. Versatile 3-in-1 Adjustable Dumbbell Set. 4 × dumbbell nuts. 2 × dumbbell bars. Dumbbell mode for individual strength training. The Versatile 3-in-1 Adjustable Dumbbell Set is designed to cater to all fitness levels, whether you're just beginning or looking to intensify your routine.