It is a chamfered door jamb, meaning a vertical stone cut with an angled edge along its face, the kind of refined architectural detail that medieval masons used to give entrances a sense of depth and finish. At sixty-four centimetres tall and just sixteen wide, it is an easy thing to overlook, yet it represents what little has survived above ground of one of Kerry's significant medieval religious houses.

The stone is believed to come from the Dominican friary that once stood in Tralee. The Dominicans, a mendicant order of friars founded in the thirteenth century, established a presence in the town during the medieval period, and their friary would have been a substantial complex with a church, cloister, and ancillary buildings, all dressed in cut stonework of this kind. Exactly when or how this particular jamb was separated from its original setting is not recorded, but at some point it found its way into the garden of the later Dominican church built on or near the same ground, where it was incorporated into a decorative rockery. It is a common enough fate for architectural fragments in Irish towns, where centuries of rebuilding have scattered medieval stonework into walls, gardens, and foundations.