O.K. guys, once and for all about these knives actually being built in Russian Prisons! I was sent a link to a YouTube video from a seller of these knives whom I have purchased 2 models from, and it explains this phenomena. I tried the link myself and it took me to the video, but when I typed it out to send to a friend and then tried it it said, "This video no longer available", so I have the title for you. Simply go to YouTube and search, "Top 5 Self-Made Weapons in Russian Prisons" and when it comes up you can see for yourselves how this works. You may need to click-on the "Settings" icon and then activate the "English Sub-Titles" so you can follow along. I hope this puts an end to the controversy!