Mul-T-Lock Key-In-Knob (K.I.K.) Cylinder

The Mul-T-Lock Key-In-Knob cylinder is a drop-in replacement for the standard cylinder inside knob locks and lever-handle locksets. It upgrades existing door hardware to Mul-T-Lock's high-security key control without replacing the lock body, handles, or door preparation -- making it ideal for large-scale office and apartment building upgrades.

Common Applications

• Office building interior doors
• Apartment unit entry doors with knob locks
• Hotel and hospitality room doors
• Classroom and academic building doors
• Healthcare facility interior access
• Retail stockroom and employee-only areas

Key Features

• Standard K.I.K. dimensions (fits most major lock brands)
• Drop-in replacement -- no door modification needed
• Compatible with Schlage, Yale, Corbin Russwin, and other major manufacturers
• Patented key control and restricted keyway
• Master key system integration
• Anti-pick and anti-bump protection
• Available in multiple key platforms

K.I.K. cylinders are the fastest path to building-wide security upgrades in NYC office towers and apartment complexes. A locksmith can swap out hundreds of cylinders in a single day without touching the existing lock hardware, immediately bringing every door up to high-security key control and eliminating the risk of unauthorized key copies.