The inside of the box is divided into two seats by an inclined separator (F) that ends at two opposing sliding-out slits. The main faces (A, B) have two slits (A1, A2, B1, B2) and the separator (F) has a slit (N) parallel to the direction in which the items can be slid out. Two arms (L, L2; M, M2) are housed and secured in said slit (N) and their width is such that they reach said two main faces (A, B). In this way the inside of the box is divided into four spaces (two for each of the faces A and B) for identical or different items.