Allowing for a natural movement this 20kg 448lbs dumbbell set ensures safe and comfortable training sessions and helps to foster good form build muscle mass as well as to improve strength and muscle imbalances the set enables you to work on your biceps triceps chest arms and back muscles and includes 12 weight plates with a durable black finish 2 chrome plated bars and 4 chrome plated precision machined smooth spinning spinlock collars providing quick and easy plate changes plus th