Square Blocks Educational Toys Interesting Unlock Wooden Puzzle
Interesting unlock is also called KongMing lock and Luban lock .It is an ancient Chinese traditional fixer for civil buildings .
Interesting unlock is a clever combination of the concave and convex parts inside the three-dimensional inserting device. Originally made of wooden structure, the exterior is a cross-shaped cube. There are many kinds of Interesting lock toys, and the shape and internal structure are different. Generally, they are easy to disassemble and difficult to install. When assembling, you need to observe carefully, think carefully, and analyze its internal structure. It is good for developing the brain, flexible fingers, and is also an educational toy for all ages .