These Standard Dumbell Bars from Marcy are a brilliant cost effective solution if your looking for some adjustable dumbells. These bars can take any 1" standard weight plate, they allow you to customize whatever weight you'd like by sliding weight plates on and off and locking them into position.
Dumbells are probably the most conventional and versatile form of weight training, free weights are arguably the best way to weight train, they allow your muscles to follow their natural path of motion putting no un-due stress where it's not necessary. With these dumbell bars and a good range of weight plates on top you'll be able to exercise every major muscle group on the body with ease, a perfect way to start out a home gym.