BS 4320 is a standard related to fasteners, which are small parts used to hold things together, like screws and bolts. RSG Fasteners is a company that makes these types of products, following the rules set by BS 4320. This standard helps ensure that fasteners are made with the right materials and measurements so they are strong and reliable. By following BS 4320, RSG Fasteners can provide quality products that meet the needs of builders and manufacturers, ensuring safety and performance in various projects. This means that when people use RSG fasteners, they can trust that they will work well and last a long time.