A ridge vent has an elongated body, a plurality of ventilation slots, and a separation line that permits easy separation of an outer edge portion of the elongated body. Each of a first set of holes adjacent the separation line has a downwardly extending cylindrical body. Each of a second set of holes adjacent the separation line has a mating cylindrical body adapted to engage and nest within the downwardly extending cylindrical body of one of the second set of holes. Moreover, a width of the ridge vent may be reduced by separating the outer edge portion from the elongated body, overlapping it with the elongated body, and engaging the mating cylindrical bodies with the downwardly extending cylindrical bodies.