Progressive training locks have become a very popular way to learn about lockpicking and improve one's skills. This set of locks is used in Red Team Alliance training courses because it progressively gets harder for both picking and impressioning.
The locks contain not only increasing numbers of pin stacks, but they also start to introduce pick-resistant drives as one proceeds through the set attempting manipulation or raking attacks.
For impressioning practice, the locks initially contain exclusively nickel-silver key pins (the harder metal marks well against the brass of a key blank) but one will encounter plain brass pins as you progress to higher number locks. Since brass key pins are softer, they will make more subtle marks during impressioning, forcing a closer inspection of the key blank during the process.
ALSO - An assortment of spare parts and assorted pins is included, so that users may reconfigure and re-pin their locks, creating newer and harder challenges as their skills progress.