Custom Weight for Every Routine: Adjustable weight range for each function—single dumbbell (6 lbs-15 lbs), kettlebell (4 lbs-19.5 lbs) and barbell (8 lbs-31 lbs). 5 in 1 Adjustable Dumbbells Set. 5 Functions in One: Replace dumbbells, kettlebells, barbells, push-up stands, and plates with this compact set.