Deadbolt security combined with cylindrical lock convenience. Simultaneous retraction of bolt and latch safeguards exit. Construction: Stainless steel deadbolts with "anti-cutting" roller inserts - Strike/Frame reinforcer against "kick-in" type attack furnished with all locks - solid brass cylinders protected by tapered rotatable, hardened steel security rings - Lock mechanism standard "A" series. Dual retraction mechanism is encased in cold rolled steel, zinc plated and dichromated. Inside escutcheon wrought brass and bronze. Entrance - Double Locking.