This heavy Duty mechanical Digital Lock Complies with British Standard 8607 Grade 5 and is suitable for use on 30 and 60 minute timber fire doors and 240 minute metal fire doors. Non handed, robust and supplied with heavy duty secure bolt through fixings, this lock is designed to be highly secure and durable. Finished in Stainless Steel and resistant to attack and corrosion this unit is ideal for use in commercial environments as well as residential settings. Each unit is supplied with a unique factory code.