High security keys and restricted keyways

GMS Lock MX-10 - Restricted Keyway

Bear Creek Lock & Safe - High Security Keys

High Security Locks – Total Security

Key Control and Restricted Keyways: Enhancing Security with High-Security Locks - Lockhart Locksmith

Schlage Mortise Cylinder 20-001 C 118 626

High Security Locks – New Way Locksmith NYC

Mul-T-Lock Interactive+ Key, Keyway is usually located at the top right side of the ID card (ex. 264G).

Mul-T-Lock High Security Key

Key Systems ASSA ABLOY DSS

Restricted vs. Standard Keyways - Kenton Brothers Systems for Security