These hinges would have been used on armour to help secure the armour in place, as well as help to dress and remove the armour.
Context
The presence of the hinges allows further dating for the armour found. There are three notable stages of the style, composition, and usage of the hinges that have been used over the course of the history of the Romans. This particular style was popular during the late 1st century CE.
The legionary infantryman would be protected by a large rectangular shield, curved to protect his body, and wore various pieces of armour. Most important was the body armour which protected his torso and shoulders. It was made up of multiple iron plates fixed to leather straps, with brass buckles and hinges. This was highly flexible and offered excellent protection. Some infantrymen also wore a flexible arm guard, similarly made of metal strips of iron or brass, and metal greaves to protect their shins.