ADJUSTABLE STRENGTH TRAINING: Heavy-duty solid, steel cogs securely lock in the adjustable plates. The solid steel handlebar weighs STRENGTH TRAINING: Perform a wide variety of exercise by incorporating strength training or intensify your lunges or squats using the dumbbells. Suitable for in-home training. PLASTIC CASE: Enjoy fitness on the go with the convenient dense molded plastic case so you can easily transport your free weights. EASY ASSEMBLY: Detaching and reattaching weights is simple. The outside collars lock in the weights for added safety.