Features: High Quality Material: Made of lightweight aluminum alloy material with excellent corrosion resistance and weather resistance; and equipped with four stainless steel screws, which are often used on any regular or irregular surface, easy to transport, and stable to install. Waterproof Rubber Pad: The bracket comes with 4 pieces of waterproof EPDM rubber pads, no need for additional rail reinforcement, more waterproof, non-slip, sturdy and durable. Screw hole design: The photovoltaic guide rail has 10 screw holes, which can be installed in any hole according to your angle, so that the direction of guide rail is more suitable for your needs. We offer two length sizes (300mm/400mm) Easy to Install: Solar mounting rail accessories, roof accessories for garden houses, garage roofs, sheds with corrugated iron roofs. Multi-purpose: Can be installed in various places such as yachts, RVs, industries, houses, tin sheds, etc. Specifications: Material: Aluminum Alloy Type: 300mm/400mm 300mm Size: Approx. 300x80x40cm/11.81x3.15x1.57inch 400mm Size: Approx. 400x80x40cm/15.75x3.15x1.57inch Package Includes: 1x Rail 4x Screws 4x Rubber Pads note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.