Adjustable dumbbells 3-in-1 set. This adjustable dumbbell set upgrades to meet the needs of the upper and lower-body workouts. Chrome galvanized . Set has two types of extension rods - straight and curved . Multiple uses of this dumbbell set are ideal to exercise arms, chest, back, core, and legs. You can adjust this dumbbell from hand-held 2.75 lb to barbell 90 lb.