https://goo.gl/SF87GR TomTop secret clearance page.
Product link: http://www.tomtop.com/diy-kongming-wooden-lock-educational-assembly-puzzle-toy-magic.html Price: US$3.96 (€3.37) This is "Lu Ban's Lock", also referred to as "Kong Ming's Lock" or the "Eight Trigrams Lock". It is a kind of carpentry puzzle game created in Ancient China. This game embodies the highest degree of civilization and wisdom. It is unique in both its style and the way in which one plays it.
