This set of 20 universal metal plates from DSTELIN is designed for use with magnetic phone car mount holders, including 10 rectangles and 10 rounds to accommodate devices of various shapes. Made of high-quality black metal, these plates are durable and have a professional appearance. Their broad compatibility allows them to fit with all magnetic mounts on the market, making device installation simple and quick. Whether in the office or on the go, they ensure devices are securely fixed in place.