Cast Iron Adjustable Dumbbell Set with Barbell Bar ConnectorIntroducing you to our heavy duty dumbbells manufactured with commercial grade cast iron. The set includes dumbbell handles and a connector rod so that you can work out with either dumbbells or barbell weights. The dumbbell bars have a 1 inch diameter which makes them also compatible with standard weight plates. (https: hajex. com collections pvc weight plates) The sleek and portable design of our dumbbell sets allows the users to carry them easily