These aren’t the cheapest on amazon, but they are very strong. I was concerned after seeing another reviewer that said their light bar fell off at highway speeds so I attached a safety cable for the first month just in case. After off-roading some rough back roads, and several times driving on the highway at 75 mph with 40+ mph headwind gusts, this thing hasn’t budged. I’m guessing the other persons issue was user error. You might have to bend or tweak the mount a little bit to make sure the magnets sit flush on the steel. Then they are rock solid. I’m using with a 52” curved light bar on the roof of my truck. I love that I didn’t have to drill any holes in my roof, and that it’s far enough back that I don’t have to deal with wind noise or the light reflecting off my hood (like if it was mounted above the windshield). Great mounts. Don’t worry, they are plenty strong if you use them correctly.