That completeness is itself worth remarking on: many of Cork's small stone circles have lost at least one of their members to field clearance, lime-burning, or simple subsidence, yet this one survives intact. The circle is modest in scale, its internal measurement along the main axis running to just 2.5 metres, and the stones themselves are low and relatively slender, ranging from 0.8 to 1.2 metres in height. What they lack in drama they make up for in precision: that main axis is oriented northeast to southwest, an alignment typical of the five-stone circles of Cork and Kerry, which frequently point towards significant solar or lunar events on the horizon.

Five-stone circles are a distinctive Bronze Age monument type concentrated in southwest Ireland, consisting of four uprights and a single recumbent, or axial, stone laid flat between two slightly taller portal stones. The alignment to the northeast-southwest axis is a recurring feature, noted by the archaeologist Seán Ó Nualláin in his systematic study of these monuments published in 1984, in which this circle at Illane appears as number 78 in his catalogue. Sitting approximately 5.5 metres to the east of the circle is a cairn, a low mound of stones that may represent a burial monument of broadly similar date. The pairing of a stone circle with a nearby cairn is not unusual in this part of Cork, and suggests the ridge was used over a period of time as a place of some ceremonial or funerary significance. The boggy ground that now covers the ridge has, in a practical sense, helped preserve both monuments by discouraging later agriculture and construction.