The slab is broken, modest in size, roughly forty centimetres tall and tapering toward its base, and its surface carries a single incised wheeled cross, the kind of early Christian carving in which a circle connects the arms of the cross and the arms themselves push outward beyond that wheel, ending in plain expanded terminals. It is an understated object, and easy to pass over, but the simplicity of the line work is precisely what makes early medieval Irish stone carving so interesting. These incised cross-slabs, where a design is scratched or cut into the surface rather than carved in relief, represent some of the earliest Christian monument-making in Ireland.

The slab originated on Illaunmore Island in Lough Derg, the long lake that runs along the border of Clare, Galway, and Tipperary. Island sites on Irish lakes frequently served as early monastic or ecclesiastical settlements, isolated enough for contemplative life but accessible by water, and a carved cross-slab of this type would be consistent with such a context. At some point the slab was removed from the island and eventually made its way into the museum's collection in Ennis, where it is now among the items on public display.