The PowerBlock Pro Series 70–90 lb Extension allows you to increase the weight of PowerBlock adjustable dumbbells beyond 70 lb, up to 90 lb (40.8 kg). Ideal for those who already own the previous extensions (Kit 1 + Kit 2), this extension adds new progressive overload possibilities. Its installation is simple and offers the advantage of replacing multiple pairs of traditional dumbbells, optimizing space in your gym or training environment.