It stands 1.4 metres tall, roughly 0.6 by 0.9 metres across, and irregular in plan, its long axis aligned northeast to southwest. That alignment is worth pausing over. Standing stones, which are prehistoric monoliths erected singly rather than as part of a circle or row, are sometimes oriented in ways that suggest deliberate astronomical or ritual intent, though the evidence is rarely conclusive for any individual example.

The stone at Pruchas belongs to a category of monument found scattered across Cork and Kerry in considerable numbers, the product of communities active somewhere between the late Neolithic and the early Bronze Age, roughly four to five thousand years ago. Individual standing stones remain among the least understood prehistoric monument types in Ireland. Their functions are thought to have varied, with proposed explanations ranging from territorial markers to burial indicators to ritual focal points, and for most examples, including this one, the archaeological record offers no further detail to settle the question. The irregular shape of the Pruchas stone, neither cleanly pillar-like nor obviously worked, is itself fairly typical of the tradition, which tended to favour locally available stone shaped more by nature than by tools.