The ADI PRO Magnetic Door Holder is designed for virtually any remote door release application. The UL-listed Magnetic Door Holder controls the release and closing of commercial and public area doors, including apartments, schools, hotels, hospitals and offices. Fail-safe operation, tri-volt coils and an adjustable armature plate allow for easy and flexible installation. ADI PRO Magnetic Door Holders may be surface or flush mounted, with all mounting hardware included in the kit.