Picture frame corner fasteners are essential components for securing the corners of a frame. Made from various materials like metal, plastic, or wood, they provide a strong and durable connection. Installing corner fasteners is crucial for ensuring the frame remains intact and the artwork within is protected. They come in different designs, including L-shaped, T-shaped, and V-shaped, and are designed to fit specific frame profiles. Corner fasteners add an extra level of security and stability to the frame, preventing it from warping or sagging over time.