The object itself is substantial: a granite basin, circular in form, measuring roughly 85 centimetres in diameter externally and 55 centimetres high, with a rim about 14 centimetres thick. A small drainage hole, just 7 centimetres across, pierces the side, a practical detail that speaks to centuries of liturgical use. Fonts like this, used for baptism and the blessing of water, are among the more durable survivals of early medieval church life, and this one is notable both for its material and its provenance.

The graveyard from which the font was taken sits on ground with a considerably longer history than the church building that eventually occupied it. According to the record compiled by Caimin O'Brien, the church and graveyard at Saggart were established on the site of a 7th-century monastery founded by St Mosacra, a figure associated with this corner of south County Dublin. Mosacra's community would have been among the early Irish monastic settlements that shaped the religious landscape of the island in the centuries before the Viking age, and the place retained its ecclesiastical character long after the original monastery had transformed beyond recognition. The granite font, with its carefully worked basin and deliberate drainage, almost certainly post-dates the monastery itself, but it belongs to a site layered with successive phases of Christian use.

The font is no longer accessible within the graveyard; it has been moved to the nearby parochial house for safekeeping, which means a casual visitor walking the burial ground will not encounter it in situ. Those with a particular interest in early ecclesiastical stonework may wish to contact the parish directly before making the journey. For anyone curious to examine the object more closely without travelling to Saggart, a 3D model has been made available online at skfb.ly/oHqIY, allowing the form and dimensions to be explored in some detail. The graveyard itself, recorded under the Sites and Monuments reference DU021-034003-, remains a legible early church site and is worth attention in its own right.