That last detail alone sets the site apart. The stone, 1.5 metres tall and unusually spatulate in profile on its decorated side, bears an ogham inscription along its northeast angle, the notched alphabet used in early medieval Ireland to record names and dedications, as well as a half-uncial text reading FINTEN, almost certainly a form of the name Fionntan, the saint to whom the site is dedicated. Above that, a ringed equal-armed cross with expanded terminals is surmounted by a scrolled crest, with a pelta motif, a curved crescent-like decorative form common in early Christian ornament, worked into the design below. Scholar R. A. S. Macalister, writing in 1937, believed he could also make out the abbreviation SCI and a Chi-Rho symbol to the left of the inscription, though subsequent examination found no legible trace of them.

The enclosure, which measures 41 metres north to south by 28 metres east to west internally, is divided by a low internal bank running roughly north-northeast to south-southwest, creating two distinct zones. The oratory sits in the southeast sector: a tiny dry-stone structure, barely 3.75 metres in its longest internal dimension, with a corbel-built north wall still standing to nearly 1.4 metres and a doorway in the west wall whose lintel may now lie as a flat flag on the interior floor. A bullaun stone, a boulder with a deliberately hollowed oval depression in its upper surface, used in early Christian contexts for grinding or ritual purposes, lies loose beside the cross-slab. A quernstone recovered from the site, likely of the Disc A type, is now held in the Cork museum. The western half of the enclosure bank is noticeably irregular compared to the clean curve elsewhere, and may represent a later field boundary absorbed into the outline. Children were still being buried within the enclosure as late as the nineteenth century, a practice recorded in the Ordnance Survey Name Books for Kildrum, suggesting the site retained its status as a calluragh, an informal burial ground for unbaptised children or others excluded from consecrated ground, long after formal religious use had ceased.