USED THESE TO MOUNT MY LED FOG LITZ TO REAR OF VEHICLE AS BACK UP LIGHTS. ALLOWS ME TO MOVE MY LIGHTS TO THE INTERIOR OF VEHICLE OR TO THE SIDE IF I NEED TO CHANGE A TIRE. VERY STRONG. I PUT PACKING TAPE OVER THE MAGNET TO PROTECT THE PAINT ON MY JEEP. THE ONLY HARD PART IS PUTTING A NUT AND BOLT THROUGH THE MAGNET. IT CAN BE DONE BUT IT WILL TRY YOUR PATIENCE.