PROIRON Cast Iron Adjustable Dumbbells Set with Extension Handle Bar Perfect for Body Building, Weightlifting, Fitness, Workout, Gym HomeLifetime durability thanks to high quality cast iron Box contents: 2 solid steel handles, 4 x 0. 5 kg discs, 4 x 1. 25 kg discs, 4 x 2. 5 kg discs, 4 x clips and an extension bar. This combination doubles the weight options compared to the set without the 0. 5kg disc. Anti loosening rubber ring on the clasp All steel grooved handle for a secure grip and safety Extension bar turns two dumbbells into a barbell bar