High Security Knob Sets Commercial Locks > Door Knob/Lever Sets > High Security Knob Sets    Ball Style Storeroom Function -MUL-T-LOCK Model: KW-2180-XXX-U4- Mul-T-Lock. Features: ·ANSI Grade 1 Locking Mechanism ·UL Fire Rated Latch ·Drill and Pick Resistant Cylinder ·MUL-T-LOCK`s Patented Interactive® Key Control System ·Limited Lifetime Mechanical Warranty.