High Quality Material: The Z solar panel mounting bracket is made of high quality aluminum alloy, which is strong, corrosion-resistant, rust-proof and durable. Installation easy: the surface is pre-drilled and easily fixed with the supplied screws and nuts, installation is convenient and simple without any additional tools. Z-bracket design: the vented Z-shape with extra edges is just what you need to protect your solar panel cells. Easy to use and perfect for uneven surfaces. Wide range of applications: ideal for installing solar panels. Ideal for mounting on caravans, trailers, boats, motorhomes or yachts etc. Package Contents: You will receive a set of four solar panel mounting brackets for mounting solar panels with mounting nuts and bolts to provide better support for unloaded solar panels on the roof.