A dedicated bump key for the restricted keyway Eurospec Mp10 cylinders. These are cut on ORIGINAL eurospec blanks meaning they are much tougher than copy blanks. The Mp10 has side pins in the cylinder meaning if an incorrect key was inserted it would push these side pins out and the core would not rotate. As these are original blanks the side cuts are already inserted however we have taken account if part of a master suite or section and introduced an almost invisible side cut that deals with this easily. In addition we have taken the shoulder off meaning zero damge to the core. We have had 100% success with these cylinders.