The name alone sets it apart from the island's better-known early Christian remains. People did not come here to pray over it or venerate it in any conventional religious sense; they came to seal a deal, joining hands through a narrow channel cut into the base stone while making a promise or striking an agreement.

The monument itself is modest in scale but carefully composed. A base stone of unworked conglomerate, roughly a metre long and aligned northwest to southeast, carries a round-bottomed channel running along its entire length. Two limestone slabs sit on top, overhanging the channel and meeting along it, so that the channel is mostly enclosed but open at each end. The larger of the two slabs, positioned at the northeast, has a pronounced convex curve on one face and a gentler concave curve on the other, suggesting deliberate shaping or selection. Writing in 1916 to 1917, the scholar Macalister noted that there may originally have been additional stones closing off the ends entirely. The clasping of hands through that narrow, covered gap carries an obvious symbolic weight: the stone as witness, the darkness of the channel as a kind of seal on whatever was sworn there.

The site sits just 2.5 metres from the southeastern shore of the island, about 40 metres south of St. Mary's Church, in ground that remains marshy and uneven. It appeared on the 1920 Ordnance Survey six-inch map marked simply as "Stone" in Gothic script, which is the cartographic convention typically reserved for antiquities, though it was still listed in the Record of Monuments and Places in 1996 only as a potential site awaiting fuller assessment. That uncertainty in classification sits oddly with the richness of the tradition attached to it.