FitRx X-Bell System Dumbbells to Barbell Converter

This dumbbell-to-barbell converter transforms dumbbells into a 30-inch barbell, macebell, or kettlebell. It supports up to 90 lbs of weight on each side. The converter fits most dumbbells with a maximum handle diameter of 1.5 inches. The price drops from $120 to $60. Shipping is free.