A revolutionary take on bump keys, the ISEO F6 bump key set tackles the problem of oversetting the longest pin by taking it out of the equation by introducing a flat spot in each one of the pin positions. Simply pull key out one click and the longest pin will still be set. Cycle through the keys giving each one approx 1 minute each. Good user knowledge of bumping and technique is required as these are particularly difficult locks to bump. The shoulders have been removed to prevent damage but we prefer to add 2 rubbers to aid as a stop when bumping.