Material: The solar panel mounting bracket is made of high quality metal material, which is not easy to damage, aging resistant and can be used for a long time Widely used: Z brackets can be used in RVs, boats, rooftops or anywhere else mounting is needed Durable: Solar panel mounts are resistant to dirt, dust, debris and weather low pressure water jets Function: the solar cells do not overheat and by bypassing underperforming cells, the solar panel can continue to operate in the event of accidental shading Packing list: 4 x brackets, 12 x screws, 8 x spacers