Metal clothing rings, commonly known as D-rings or O-rings, are small metal rings used as functional or decorative elements in clothing and accessories They come in various sizes and sizes and are made of materials such as steel a composite, brass, stainless and in metal, or plastic. Metal rings are commonly used as strap adjusters on garments such as bras, swimsuits and lingerie. These wearers can adjust the length of the straps for optimum fit and comfort. The selection of steel fabric rings depends on the intended function, design and durability requirements.