... . You'll have all the weights you need in one set of Bowflex 552 Dumbbells2. Adjust in 2.5 lb (1 ... can gradually increase your strength without bulking up3. This 522 dumbbell can adjust scope :5, 7.5, 10, 12.5, 15 ... the next - less time wasted, more time getting fit! Adjustable Dumbbell 552 FT5140