The 2 Inch Olympic Barbell Clamps Lock Clip Quick Release Collars by Samarium Strength are designed for heavy-duty gym training. Made of durable plastic and rubber materials, these black collars come in a set of 2 and fit 2-inch barbells. With a sturdy construction and a personalized touch, these Olympic collars are perfect for strength training and gym workouts. The quick release feature allows for easy on and off, making them a convenient addition to any home or commercial gym setup.