A bump key is a specially crafted key that can open pin tumbler locks, which are commonly used in residential and commercial properties. It is designed to fit into the lock and, when struck with a tool, can cause the pins inside the lock to jump, allowing the lock to turn and open without the original key. Bump keys are often made from standard keys by filing down the cuts to create a uniform height across the key's blade. This technique exploits the mechanics of the lock, making it a potential security risk. Awareness of bump keys can help individuals take precautions to secure their properties better.