Z type design: unique design, ideal for uneven surfaces, can mount panels on the motorhome, caravan, yacht, roof, etc. High performance: made of alloy of High quality aluminum, anti-corrosion, anti-rust, wear-resistant and durable. Bracket size: the width of the mounting screw panel is 30mm, and the total length is 60mm. Easy to use: Lightweight aluminum alloy construction, easy to transport and install, ideal for mounting a range of solar panels. Package includes: This kit solar panel mounting kit contains 4 x 1-hole mounting brackets, 8 bolts and 8 nuts. Please note that due to manual measurement and display differences, there may be slight differences between individual products and photos.