Access or proximity cards will have slot punch indicators, small dots visible on the card back
which show the only allowable slot locations for the card. While it is perfectly acceptable to slot punch your access cards, we strongly suggest using badge grippers or clamps instead. These attachment devices work the same as slot clips, and better maintain the structural integrity of your technology card.
If you must slot punch the card, carefully center the indicator marks to the punch, and punch only where the indicator marks appear. Any other position may damage the interior circuitry and thus cause the card not to work.
Always test the first card after printing and slotting. Once you are satisfied with the results you can go ahead and print the rest of the batch. For more information contact an expert at Safe-Card ID Services today.