Our company mainly produces educational toys Luban locks. The mortise and tenon structure used in Luban lock is a widely used connection method for ancient buildings and furniture in China. The convex one is "tenon", the concave one is "Mao", and the mortise and tenon joint place can be fastened tightly without an iron nail. Compared with direct nailing, mortise and tenon joints are stronger and can effectively resist the twisting and deformation of wood