What makes a lock high-security
Three things, and a lock has to do all three before the label means anything.
- Pick and bump resistance. Sidebars, telescoping pins, rotating pins and finger pins add a second axis a pick has to satisfy at the same time as the shear line.
- Drill and attack resistance. Hardened inserts at the shear line and the sidebar, anti-pull and anti-snap construction, and a body that does not give up to a cordless drill.
- Copy control. A patented keyway, so a copy is legally possible only through an authorized dealer against a signed key card. Without this the other two are decoration: a perfect lock opens for a key somebody cut at a kiosk.
A Grade 3 builder deadbolt does none of them. That is the gap this page exists to close.