Schneider Electric ESM31X2 1 Gang Metal blank plate with box is a durable and impact-resistant cover plate for an empty electrical box. It is typically used in commercial and industrial applications where a durable and impact-resistant cover plate is needed. The blank plate is made of a heavy-gauge steel and has a smooth, finished surface. It is also painted grey to match the surrounding walls. The box that comes with the blank plate is a square metal box that is used to house electrical devices such as switches and outlets. The box is typically mounted to the wall using screws or nails.