Bought a 27" led light bar for my pick up, the 4 magnets on the lightbar were weak, would not trust them to hold bar to truck going above 60 mph. Bought two sets of these magnet mounts to replace the original magnet mounts. Much stronger hold, don't see a problem doing 75 mph on a windy day with strong gust. Will update after I've run these a while. Update: these magnet mounts work great, been running them for 5 months now without any movement of my lightbar, that includes brushing against small low hanging branches. I highly recommend these mounts, they hold my light bar very secure, better than I expected. Extremely happy with their performance.