What is a Spool Pin? November 09, 2018 00:06 Follow A Spool Pin is a spoil shaped pin tumbler used in some cylinder locks to foil picking attempts. Related articles How secure is Array when connected to my home Wi-Fi? What is the warranty policy for the Array By Hampton Deadbolt? How do I Master Reset my Array? (discovery mode) What is the "Handing" Process? What does WPA2 Encrypted mean?