HQ LOCK High Security Rim / Mortise – 1 1/8″ – 26D Satin Chrome (5 Keys Included)

High-Security cylinders have a special telescopic pin tumbler mechanism with internal and external pins.

Steel inserts with high drill resistance
High pick and bumping resistance

A spring-loaded pin placed inside the cylinder plug, which produces a “virtual combination” when the key with the floating pin is inserted.