What is a metal chain attached to the curb bit known as?

The metal chain attached to the curb bit is known as a curb chain. This component serves several important functions in the context of horse equipment. Primarily, the curb chain helps to prevent the curb bit from slipping through the horse's mouth, ensuring that the bit stays properly positioned. Additionally, the curb chain acts as a leverage tool, enabling the rider to apply pressure more effectively on the horse's jaw and chin when reins are pulled. This promotes better communication and control between the rider and the horse. Its design usually consists of linked metal and is specifically tailored to fit with curb bits, contributing to the overall functionality of the bridle.

In contrast, side reins are used in lunging to keep the horse balanced and encourage proper head carriage, while a bridle chain is not a commonly recognized term in horse equipment, as the bridle itself includes the complete headgear. Furthermore, a browband is simply a decorative or functional piece of the bridle that sits across the horse's forehead, securing the bridle in place, and does not serve the same role as a curb chain.