Bumping, also referred to as "rapping" is not a new technique for opening locked car doors. In fact, it's been around for at least half a century! When this method is used correctly it is extremely powerful. As with any other lock picking technique it requires some time and patience to be able to master. A bump key is a key in which all the cuts are at the maximum depth of (999). Bump keys can be cut for standard pin tumbler type locks as well as "dimple" locks. We offer a variety of bump keys as well as hammers below. Here's some information about how "bumping" works written by our friend Datagram.