The P-A7 Heavy Duty Punch Bag Spring is an essential accessory for anyone looking to hang a punching bag with ease. It can be used with chains, or it can be applied directly to a punching bag that's hanging on a bracket or free-standing unit. This spring is made from high-grade reinforced steel and features a 360-degree rotational swivel and two oversized 9mm thick carabiner locks, which ensure the punch bag stays secure. It's ideal for hanging punch bags that weigh up to 150kg, making it perfect for heavy-duty use.