Abstract: A container-locking mechanism for locking two perforated overlapping sections of a carbon or the like. An outer tubular member is fitted into the aligned holes in the sections and formed at one end with a radially outwardly extending flange. An inner tubular member has a plurality of circumferentially spaced tapered portions. The inner tubular member is locked in a position when fully inserted in the outer tubular member. The outer tubular member has a plurality of arms arranged to be engaged and forced radially outwardly beyond the outer peripheral surface of the outer tubular member, by the tapered portions, when the inner tubular member is inserted into the outer tubular member.