The MK Electric Metalclad Plus 1-Gang Spare Surface Metal Back Box K899 is a set of 10 square grey metal back boxes designed for electrical sockets and switches. With a sleek grey finish, these units are perfect for DIY projects in the home. The surface mounting style and on/off operation method make installation quick and easy. The MK Electric brand ensures quality and reliability, while the durable metal material ensures longevity. Ideal for creating a seamless and modern electrical setup in your home, these back boxes provide a secure and stylish solution for your electrical wiring needs.