These magnets are to week to stay on a fender or tailgate since i do night work they need to stay blinking as I’m moving around the job sight poor quality magnets not good for construction.This light is very bright, only thing is when I put it in my carrier box,when I went to turn it back on it did not come on I had to open it up take then batteries out ck them to make sure they were good they were, reset them back an they :worked, it takes to much time to open back an the little nuts fall out other then that they work good very bright since I work in construction driving Truck an Trailer.