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SFIC (small format interchangeable core) is the figure-eight core that is standardized across brands, so it is the default choice for new systems and mixed-brand buildings. LFIC (large format interchangeable core) is a larger, brand-specific core. Buy LFIC only when your existing locks are built for it, such as Sargent, Corbin Russwin or Schlage full-size (FSIC) hardware, and you want to keep that key system. The two formats never interchange. S… Read more