The Lock Locker Bump Proof Deadbolt Door Locker keeps your door lock secure from intruders. It stops bump keys, 3D printed keys, lock picks, stolen keys, copied keys and more. The “key” so to speak is the design. Powerful magnets keep the two parts together, but they allow for easy removal and reconfiguring. And because it is made of super high impact material, you will break a key before unlocking the door. It’s compatible with most deadbolts.