This innovative 20kg dumbbell and barbell set from Ironman can also take more standard weights should you need them. The dumbbell set includes two handles, four 0.5kg plates, four 1.25kg plates, four 2.5kg plates, 4 collars, and an extended bar that allows you to convert them to a standard straight bar. Strictly selected materials, free of phthalate and lead. Rubber O-ring anti-loose design on collars. Free connection steel tube to change dumbbell to the barbell which gives you more functions to build up muscle. With the steel connection tube, you can add more weight plates from 4kg to 33kg (including bar weight) Ergonomic designed knurled handle grip makes your hands more comfortable. 143mm wide handgrip part gives more room for your hand to grip, making it easier to lift without bumping your wrists for doing certain exercises.