Bump key

Are You in Danger From Bump Keying?

Citywide Locksmith Westwood Highly Recommend Mul-T-Lock bumps proof locks for your home, apt and business.

Lock bumping, or bump keying, is a technique for picking a pin tumbler lock.  A single specially made bump key works for any lock of the same type.  This technique was first developed by locksmiths, who discovered that applying pressure to the back of a lock plug while knocking on it would let the plug slide out freely.  That made it easy to disassemble a lock.  However, this technique isn't just a handy tool for locksmiths.  It can be a major security concern.