ZH - 0121 Transparent Practice Padlock Inside-view Pick for Locksmith Main Features: ● It is 6 pins padlock. ● Transparent lock case lets you see clearly all parts inside! When lock and unlock, you can watch clearly every part how to work. ● When the key inserts into or out of the plug, you can see the pins moving down and up. Let you know how the shear line come out. ● It is the right practice lock for beginner to study how to open a lock, and know about the structure of a padlock. ● It is also regarded as a funny and fantastic gift or toy.