What makes it quietly arresting is the precision of its survival: a single roof stone still covers the gallery, and the outer walling that once enclosed the whole structure remains closely set around it. A large boulder sits just to the south of the monument, its relationship to the tomb unclear, though its presence adds to the slightly compressed, deliberate feel of the site.

Wedge tombs are the most numerous of Ireland's megalithic tomb types, built predominantly during the late Neolithic and into the early Bronze Age, roughly between 2500 and 2000 BC. They take their name from the characteristic shape of the burial gallery, which tapers in both height and width from west to east. At Lackaduv, that tapering is measurable and distinct: the gallery runs roughly ENE to WSW, with a width of 1.55 metres at the broader western end narrowing to 0.7 metres at the eastern end, and a total length of 2.4 metres. Two sidestones define the northern wall of the gallery, three the southern, and a backstone sits just outside the gallery walls at the eastern end. Traces of a possible mound survive to the south and west, hinting at what the monument once looked like when its earthen covering was intact. Catalogued by Ruaidhrí de Valera and Seán Ó Nualláin in their 1982 survey of megalithic tombs, the site is not isolated in the landscape: a second wedge tomb stands approximately 220 metres to the south-south-west, suggesting this stretch of the Laney valley held some significance for the communities who built here.