We want to make the topic of safety technology as transparent as possible for the users.
The antennas are usually in the form of a coil. For miniature transponders, the diameter of the antennas is usually a few millimeters, for applications with longer ranges, antenna diameters of up to half a meter can occur.
Example of an RFID tag in the form of a check card.
Basically it is possible to punch holes in the badges. But we generally do not recommend to punch holes in the badges.
If you still need a hole, ask in advance exactly where it is possible to punch a hole.