With the simple twist of the handle you're ready to go with this new remarkable adjustable dumbbell. The innovative locking mechanism secures only the weights that you want, a second is all it takes to change the weight of this dumbbell. This means that you waste less time switching weights and spend more time building muscle to achieve your goals. The PowerTrain adjustable dumbbell's ergonomic design makes it the most space-efficient and flexible strength-training option available. With just the twist of a handle, you can automatically change your resistance on this dumbbell from 5 pounds all the way up to 45 pounds. It adjusts in 1.5-pound (approx.) enabling you to gradually increase your strength while training with the perfect weight to push your limits. Brilliantly effective while performing super sets and drop sets as there is no wastage of time as you go through different phases of your circuit, switching from one exercise to the next.