Wedge tombs are the most numerous megalithic tomb type in Ireland, built during the later Neolithic and into the Bronze Age, typically comprising a roofed stone gallery that narrows and lowers from one end to the other. This one at Knockane is modest even by those standards, its gallery estimated at around two and a half metres long and roughly a metre wide at its eastern end.

What can still be read from the surviving stones tells a fairly complete structural story. Two sidestones on the northern side, one on the south, and a backstone at the eastern end sit beneath a roofstone, while the southern edge of what is likely a second roofstone is just visible to the west. A stone exposed to the northwest may represent part of an outer wall, and three further outer-wall stones survive at the eastern end of the gallery. The tomb is aligned east to west, a common orientation for wedge tombs, and was recorded in detail by Seán Ó Nualláin in 1989. The western end, however, is obscured by rubble accumulated from the clearing of surrounding fields over the years, a reminder of how agricultural activity has shaped, and in some cases hidden, the prehistoric landscape.