Master Lock - 4 Pro Series 6230NKA-4 High Security Padlocks w/ BumpStop Technology. Each

Product details

Featuring BumpStop Technology - The lock bumps on a surprisingly simple method of breaking locked doors and padlocks, it is undoubtedly the newest emerging threat to the security of personal property. And almost all locks used today are particularly vulnerable to shocks. Until now. Advanced BumpStop Cylinder Technology utilizes an innovative patent-pending design that utilizes a unique reverse rake pilot taper pin, high performance springs and tightly machined cylinder chambers. During a keystroke attempt, this design prevents the transfer of force from the bump key to the pins and therefore blocks the rotation of the cylinder so that the lock remains locked.