Schlage L9485 x XL11-557 Prison function lock

• Key cylinder outside with knob; knob only-inside; deadbolt, latchbolt and deadlocking auxiliary latch
• Outside knob always free spinning; latchbolt retracted by inside knob
• Inside knob is made inoperative (fixed) when deadbolt is thrown by guard key outside
• Guard key outside retracts deadbolt and unlocks inside knob; in unlocked state use of prisoner’s key outside retracts latchbolt only