Lockly uses 6-pin cylinders for their Deadbolt Editions and 5-pin cylinders for their Latch Editions. These cylinders can be replaced using rekeying kits available from various brands in the market. Many customers have successfully had professional locksmiths rekey their Lockly devices. Always consult the specific instructions provided by Lockly® for your particular model of smart lock, as re-keying procedures can differ slightly between different models and manufacturers. If you are uncertain or uncomfortable with re-keying the lock yourself, it is recommended to seek assistance from a professional locksmith to ensure the process is done correctly and efficiently. See link for information on compatible rekey kit and in-house rekey kit.