Dumbbell Set Cast Iron 20 kgThe 20 kg Cast Iron Dumbbell Set in Detail Solid cast iron for your workout! With these dumbbells you can work intensively on your biceps and triceps. Specialised exercises are also ideal for working your upper body, chest, back and shoulders. What is the Size of the 20 kg Dumbbell Set? 4 x 1. 25 kg weight plates, diameter 12. 3 cm, width 2 cm 4 weight plates of 2. 5 kg each, diameter 16 cm, width 2. 3 cm 2 dumbbell bars 35 cm (weight 2. 5 kg each),