The structure measures 10.6 metres across at its base and rises 2.5 metres high, tapering to just 3.5 metres in diameter at its peak. At the very top, a curious depression sinks about a metre deep and spans nearly 3 metres wide; whether this hollow formed naturally through centuries of weathering or was deliberately created remains unclear.

This ancient cairn found a second life in more recent centuries when surveyors chose it as a trigonometrical station, using its prominent position to help map the surrounding countryside. The mountain summit where it sits appears to have been a significant location throughout prehistory, as archaeologist O. Davies recorded numerous hut circles scattered across the slopes, suggesting this was once home to a thriving community who likely built their dwellings here for the commanding views and defensive advantages the height provided.

The cairn forms part of Donegal's rich archaeological landscape, documented in the comprehensive Archaeological Survey of County Donegal compiled by Brian Lacey and his team in 1983. While its original purpose remains enigmatic; it could have served as a burial monument, a territorial marker, or a ceremonial site; the cairn continues to draw visitors who climb Raghtin More to encounter this tangible link to Ireland's distant past.