A standard deadbolt is a solid basic lock — but its key can be copied at any hardware store, and its cylinder offers limited resistance to picking, drilling, and bumping. For many apartments it is adequate; for anyone who has lost track of key copies, it is a weak link.
Mul-T-Lock cylinders change both sides of that equation. The patented keyway and hardened components resist the common attacks that defeat standard locks, and — just as important — keys cannot be duplicated without your authorization. Every copy is logged.
The upgrade usually retrofits into your existing deadbolt or mortise preparation, so you keep your door and your exterior look. If key control matters to you — landlords, businesses, or anyone starting fresh in a new apartment — it is the single highest-value security upgrade we install.