The Luna joining cup is made of plastic, a material characterized by its resistance and durability. It has a white plastic finish, and brown plastic, both in order to be imperceptible to the eye when installed. Its function is to hold and fix the shelves and shelves in cabinets, bookcases, and other home furniture, providing a solid and secure grip. For its assembly, machining is required on the 20 mm diameter board as it will be embedded in the lower part of it. It is valid for shelves up to 16 mm thick. Finally, its packaging presentation is 2,500 units.