Sturdy and Reliable. Made of high quality steel, strong, safe and not easy to rust. They allow heavy sandbags to move smoothly and prevent wear and tear on the surface of the sandbags and hanging sandbags. Whether you use them in the gym or outdoor activities, they allow you to hang sandbags smoothly and safely. Heavy weight bearing: These spring hooks can hang sandbags weighing up to 255lbs. Hang anything you want, such as punching bags, swings, aerial yoga straps, exercise rings, hammocks. Highly Secure. The closed end loops securely connect the professional heavy bag spring, and bracket together, so they won't come apart and cause an accident. Reduces Noise: The Heavy Duty Bag Spring reduce the impact of the sandbags when they are knocked down by heavy objects, inhibit bouncing and swaying, and reduce the impact of vibration on the structure of your house. Reducing Sports Noise If you are a professional boxer or just a fitness enthusiast, you need to use this Heavy Duty Bag Spring in your daily training. It provides a solid and stable foundation for your sandbags, allowing you to focus on what matters most: honing your skills and building strength. With its top-notch construction and flexible design, this sandbag spring hook is a great choice for any boxing or gym setup.