It is a door or window jamb, a vertical element that once formed part of a structural opening, cut from limestone and finished with a single external chamfer, that is, a narrow angled edge worked along one face to soften what would otherwise be a sharp right angle. The fragment measures roughly 34 centimetres wide and 29 centimetres tall, with the chamfer itself running about 9 centimetres across. Dimensions modest enough to hold in two hands, yet the care of the cutting speaks to a building that once warranted proper stone craftsmanship.

The fragment is one of several architectural pieces in Tullaghmelan graveyard that are associated with the medieval church that formerly stood here. The church is gone, or at least gone as a standing structure, and what remains are these scattered remnants, physical traces of a building whose original form can only be partially reconstructed from the stonework left behind. The chamfered jamb is the kind of detail found in ecclesiastical architecture of the medieval period in Ireland, where dressed stonework around doorways and windows was one of the primary ways a builder would signal the quality and intention of a structure. That this piece has ended up flush with the ground, rather than raised or displayed, gives some sense of how such fragments tend to fare once their parent buildings fall.