It measured roughly ninety centimetres tall, forty-two wide, and twenty-five deep, and on one of its faces someone had carefully incised two Greek crosses, each enclosed within a circle, connected to each other by a horizontal bar. The crosses, circles, and bar were not simply scratched into the surface; each element was defined by incised bands, giving the design a deliberate, almost architectural precision. The stone is no longer at Killeen. It now sits in the National Museum of Ireland.

The scholar H. S. Crawford noted the stone on visits in 1913 and again in 1926, finding it in situ within what appeared to be the remains of an early ecclesiastical site. Ecclesiastical enclosures of this kind, typically circular or oval boundaries that once marked sacred ground around an early Irish church or monastery, are often the only surviving trace of religious communities that left no standing buildings. The carved stone itself belongs to a tradition of early medieval Christian stonework found across Ireland, in which Greek crosses, equal-armed rather than the elongated Latin form, were incised into slabs as grave markers, boundary stones, or objects of devotion. The pairing of two crosses linked by a bar is less common, and the combination of circle and incised banding gives this example a considered compositional quality that sets it apart from more casual scratched examples.