Worldwide, the #1 Master Key Software is used by thousands of locksmiths. It is used to unlock thousands of doors, schools, hospitals, schools, many Las Vegas casinos, the US Military, restaurants, and other establishments. Flexible: You can change pin sizes, step, and MAC to alter the bitting array to keep constants. You can create systems for all pin locks, 5, 6, and 7, with the included keymark and biaxial. Special ones such as Emhart, Medeco (including Keymark & Biaxial), and removable cores like KABA Peaks and Best Falcon A2 & A4, Sargent, Corbin and Russwin.