hollowing out a piece of stock and squaring off the ends to leave a tubular space inside a box. to create container hold round objects . like a wine bottle . in this way the ends do not have any joinery giving the box an extra craftsmanship and value . I was thinking of using a round nose router bit to hollow the center then some sort of round dado blade to square off the ends . I have no idea if such a tool exists or if this might be something that would have to be custom made ?