Ballykeel portal tomb looks very like Legananny portal tomb. Three massive upright stones support a large and sharp-cornered flat capstone. A smaller stone seals the entrance between the tall portal stones at the southeast (150°) of the monument.
This structure was the portal to a large cairn which has long gone, though the outline of it still very visible on the ground. The excavations carried out in 1964 revealed that the tomb had already been disturbed and likely deprived of some items, but many fragments of Neolithic pottery were still found.
At that time the capstone slipped when the backstone split. This stone was repaired using a special cement and the capstone was reinstated.
Just like the Legananny portal tomb, the capstone of this tomb touches the upright stones in small points of contact. Both the lower side of the capstone and the south upright portal stone have cupmarks on their surfaces.
The portal tomb is 1.99 metres tall at the entrance, the lowest point at the back is 1.20 metres from the ground. The overall length is 2.93 metres and the width at the entrance is 1.73 metres.
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