The double cylinder deadbolts are keyed on both sides. On the interior side of the home there are drive pins (sometimes called screw covers) covering up the screws. Recommended method: Indent the center of each drive pin with a nail punch. Then use a carbon tip drill bit (about the size of a pencil lead) and ONLYgo down 1/8". The drive pin will disintegrate. The drive pins will need to be replaced as they are no longer usable.