Body Power 30kg Dumbell Set #BPDBS30 The Body Power 30kg Spinlock Dumbbell Set is fully adjustable, offering you enormous variety in weight selection. It’s quick and easy to load up the weight plates, simply slide the desired plates onto the bar and then spin on the collars, securing the plates in place. Our spinlock collars provide a quick and safe way of securing your plates on the bar, and the heavy duty chromed collars in this set feature a rubber washer on the inside, further enhancing grip and preventing the weights from moving around and making noise during use.