The ‘IT’ and ‘OT’ Receivers each have a slanted surface upon which the Latch hook slides when locking, imparting a lateral force when compressing the door panel against the case. This is especially beneficial when gasketing is involved. Both the ‘IT’ and ‘OT’ Receivers can be used either inside or outside a case. See TDSs 21-1 and 21-2, and 41-1 and 41-2.