A device is provided for blocking an opening formed in an automobile roof, including a fixed glass portion to be rigidly connected to the vehicle and at least one glass panel. The heat treatment system is used in a heat treatment process for semiconductor devices, such as a crystallization process for an amorphous silicon thin film or a dopant activation process for a poly-crystalline silicon thin film formed on a surface of a glass substrate of a flat display panel including a liquid crystal display or an organic light emitting device. The base is disposed on the socket for covering the socket.