These are bullauns, cup-shaped depressions ground into stone that are found at early medieval Christian sites across Ireland, though their precise original function remains debated. Some are associated with holy wells or monastic enclosures; others appear in isolation, their context long eroded away. What makes a bullaun stone quietly compelling is the accumulated labour the basins represent, the patient grinding of stone on stone over generations, for purposes that may have been ritual, practical, or both.

The boulder at Baltynanima is earthfast, meaning it is set directly into the ground rather than placed as a freestanding object, and it measures roughly 1.2 metres square with a thickness of around 0.4 metres. Its two basins differ slightly in size: the smaller measures approximately 0.3 metres by 0.27 metres and reaches a depth of 0.13 metres, while the larger is around 0.41 metres by 0.39 metres and deepens to 0.18 metres. The material is granite, a stone common to the Wicklow uplands, and the regularity of the basins suggests deliberate and sustained shaping rather than natural weathering.