Hole drilling is the available display option for reflective aluminum. You can add holes on all 4 corners, at the top, or on the top and center of your signs. This works best on signs that are screwed onto a wall or gate. Grommets are the display option for 3/16” corrugated plastic signs. These let you hang the sign with a rope or other similar material without damaging the sign. You can add 2 grommets on top or a grommet for each corner.