It is barely the size of a hardback book, roughly fourteen centimetres tall and twenty-five wide, and whoever set it into the wall either did not notice or did not much care that the inscription was inverted. The visible face carries only a fragment of incised text, the rest of the original slab either lost or hidden within the masonry itself.

The stone was catalogued by Elisabeth Okasha and Katherine Forsyth in their 2001 study of early medieval inscriptions in the British Isles, where it is listed as Toureen Peacaun 14. Okasha and Forsyth describe it as a fragment of a slab of unknown original form, meaning there is no way now to say what shape the complete object once had, how large it was, or how much text it carried. What survives is partial and inverted, embedded in the church wall as a piece of convenient building material at some point in the structure's history. St Peakaun's itself is a medieval church ruin associated with the sixth-century saint Mochaomhóg, also known as Peakaun, and the wider site at Toureen is known to contain a number of early Christian monuments and carved stones. That this fragment ended up built into the fabric of the church rather than preserved as a discrete object is not unusual for the period; cut and dressed stone, including pieces bearing inscriptions, was routinely reused as the most practical material to hand.