Bump Keys are an old locksmith method of opening or bumping locks. Bump keys are typically made by taking a standard key,and cutting the valleys down to the deepest manufacturer"s depths, then shaving a little material from the tip and shoulderof the bump key. Our method creates a Bump key that does not need to be modified. For more information please visit our Documentation and Instructions page, or our FAQ page. Please Note that we do not sell pre-modified keys anymore. Check the product descriptions before purchasing. We will not issue any refunds for those that do not read about what they are buying.