IC Core mortise cylinders installed on commercial glass doors. If your business has these floor based locks and you plan on rekeying your business on a regular basis, we definitely recommend these ic core cylinders because they make it easier on the locksmith. Why does it make it easier you may ask? Well, instead of the Locksmith being on the floor in high traffic areas like a mall and blocking door traffic, it takes seconds to remove the ic core cylinder and minutes to rekey and seconds to put back. We can even sell and rekey you dozens of different keyed cores and supply you a control key to put the new cylinders in for future use.