I bought these hoping they would fit snugly in the holes left over from the license plate, after finding out I had to be careful of the plate depth as the first end caps I bought weren't deep were enough i found them..after two coats and the cost of a clear coat i was ready to fit them into the bumper.at first i didn't think they would do it but then i put in a little more effort and they snapped They fit perfectly into the bumper!They will stick firmly to the surface.If you have a Honda or Acura with 1/2" holes in the bumper and want to fill them in, this is what you need.