1. chassis precision aluminum die casting process, not deformed. 2. The protective cover with cold stamping process, resistance to lateral pressure and corrosion resistance. 3. saved fibers and flexible assembly, flexible capacity. 4. The use of high-quality stainless steel screws, durable anti-rust and corrosion. 4. The connector box made of high quality ring seal, and fully guarantee the sealing performance. 5. Product comes with a full set of security tools, easy to install and use 6. Simple structure, reusable open. 7. Quality reliable, durable 20-year 7. stocked, ready delivery. 8. Independent packaging, transportation convenience