Amazon.com: FORREC Barbell bar 50mm, Dumbbell bar with Spring Lock, Length: 50 cm, Weight: 4 kg, Chrome-Plated, knurled, Steel : Sports & Outdoors
2 Pieces Barbell Bar Adapter Sleeve Accessories 25mm to 50mm Convert 1 Weight Posts to 2 for Strength, Fitness, Equipment Weightlifting, B - Walmart.com