The Starlink Gen 3 roof mount kit uses two 50-pound-tension neodymium magnets and a rubber-backed steel plate to ensure a stable fixation on iron surfaces. Suitable for installation on iron roofs, cars, campers, SUVs and trailers, no drilling is required and it is easy to install. The magnets have a rubber coating to protect the car paint, and the kit includes rust-proof 304 stainless steel hardware and an enlarged 2.6-inch magnet to ensure a neat and tidy setup. Note: Do not connect two magnets together when using to avoid pinching your fingers.