Belt hardware is an essential component of many garments, and the most common type is the BUCKLE. A BUCKLE is a fastening device consisting of two parts, one with a metal loop and the other with a prong or tongue that fits into the loop. It is used to secure items such as belts, straps, and bags. Buckles come in a variety of shapes and sizes, and can be made from a variety of materials including metal, plastic, and leather.