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