A customizable key holder for retention of at least one key; the key holder comprising two separate outer sheathing plates which store the at least one key between them; one or more removable locking pins utilizing a locking mechanism to secure the at least one key between the outer sheathing plates; the key holder further including one or two interchangeable sheathing plate covers adapted for personalization of the key holder; at least one of the interchangeable sheathing plate covers providing storage space for an accessory element.