Interchangeable Core, Security Locks
"Luter has Small and Large Format Interchangeable Core (SFIC& LFIC) locks"
A special control key unlocks and allows removal from the front of the lock of the core. New cores can be swapped in and out in a few seconds are required, not to use for tools on special locksmith skills.
Luter’s SFIC locks come in 6 and 7 pins versions and can use the same key for either(KA), this allows up to 10,000,000 distinct keys per keyway(KD).
The control key (cut out the same blank and otherwise indistinguishable from a regular key) turns to degrees clockwise to disengage a retaining tab that locks the core in the housing.
The core pulls out while the housing stays in place in the door.
Luter's SFIC housing are also manufactured for rim cylinders, key-in knob locks, padlocks, cabinet locks electrical switches, etc.