- Cast Iron Weight Plates- Set Includes: 4 x 0.5kg, 4 x 1.25kg, 4 x 1.0kg, cast iron weight plates. (5KG pair)- 2 x Chrome Plated Dumbbell bar with Spin lock collars.- Fully adjustable Starter Set.- Dumbbells are great tools for strengthening and toning a wide variety of muscles including the biceps, triceps, deltoids, latissimus dorsi, quads, glutes, hamstrings, calves and core abdominals.