A two-part securing unit wherein the interconnection of the two parts is assured once they are assembled. The securing is useful in securely fixing at least two printed circuit boards in parallel relation, the securing unit being attachable to a chassis or to another form of fixed plate. The two parts of the securing unit are relatively pivotable, whereby the outermost board may be moved to an open state to allow easy repair or inspection. The securing unit is capable of holding the two plates rigidly in the open state, such that repair or inspection may proceed without the necessity of manually supporting the outermost board in its open state.
