The piece is a chamfered pick-dressed window jamb, meaning it is the vertical side-piece of a window opening, with its corner cut away at an angle and its surface dressed by a pick rather than smoothed flat, a technique associated with medieval ecclesiastical stonework. It measures just 29 centimetres high, 30 centimetres wide, and 26 centimetres thick: roughly the size of a large book, though considerably heavier.

The jamb is thought to have come from the medieval Dominican friary that once stood in Tralee. The Dominicans, a preaching order founded in the thirteenth century, established a number of friaries across Ireland during the medieval period, and their houses were typically substantial stone structures with elaborately detailed windows, arcades, and chancels. The Tralee friary would have been one such complex, and fragments of its fabric have evidently survived in unexpected ways. At some point, this particular piece of dressed stonework was incorporated into a rockery, the kind of informal garden feature popular from the Victorian era onward, where stones of varying origins were often arranged decoratively without much concern for their provenance. It now sits in the garden of the modern Dominican church, a successor institution to that earlier foundation, which lends the fragment a quiet continuity even if its current setting is entirely unplanned.