Abstract: A hinge structure is formed by at least two ears projecting from one side edge of a panel with each of the ears being provided with a lobe extending in the same direction from its respective ear and spaced from the edge of the panel to provide an undercut. The ears are adapted to be projected through cooperating slots in a second panel to which the first panel is to be hinged and slid laterally in the slots to position each ear on the opposite side of the second panel and out of alignment with its slot so that a portion of the second panel is received in the undercut or space between the adjacent lobe and the edge of the first panel. A tab moveable from an open position permitting insertion of the ear into one of the slots to a locked position to engage each ear in that one slot and prevent reverse movement of the first panel to move the lobes from behind the second panel is provided to lock the hinge parts together.