DIYMAG12Pcs Rubber Coated Magnets, Adhesive Power 30LBS Anti-Scratch Neodymium Large Magnet Base with M5 Threaded Magnet with Bolts and Nuts, Strong Magnets Hold for Light Bar, Mirror, Camera, PTZ

Some strong magnets right here.I have a 100 watt flexible solar panel on the roof of a truck. While I haven't tried it on the highway ( more concern over the panel less about the magnets) I can say these keep it on the roof easily. They don't let go easily. The rubber coating is nice for scratch resistance, and the screws were just the right size for the panel.If you want something quick to put something like a flexible solar panel on, put the magnets on the grommets and place it on the vehicle, if you need to remove them, I undo the nuts, don't try and lift the magnets with the panel.

Was delivered fine and seems like they will work for my application but have yet to install, will update when that happens

These magnets are the real deal. Super strong, don’t scratch whatever they are attached to. The strength of these magnets is unbelievable. Dont get two of them stuck together because you’ll have to pry them apart.

They RUST BADLY CAUSED RUST STAINS ON WHITE TRUCK TOP

Great description and quality

Used these to mount my Cyclone KC lights. Work great. Good quality.

Used for a homemade phone holder for streaming games. Powerful and easy to use

VERY strong magnets. Keep away from phones and computers. Long delivery time