This set adjusts from 3-21 lbs in 3 lb increments (3, 6, 9, 12, 15, 18, 21 lbs) in each hand. This set has a maximum weight of 21 lbs per hand and cannot be made heavier than the 21 lb maximum weight per hand. It replaces 7 pair or 14 fixed dumbbells that would have a combined weight of 168 lbs.