The stone stands 2.7 metres tall, rectangular in profile, and measures 0.8 metres by 0.45 metres at its face. Its long axis runs NNE to SSW, an alignment that may or may not be intentional in an astronomical sense, though such orientations are common enough among standing stones across Ireland to warrant at least a passing thought.

Standing stones are among the most enigmatic survivals of prehistoric Ireland. Erected during the Bronze Age in most cases, their original purposes remain genuinely unclear, with theories ranging from territorial markers and memorial stones to components of larger ritual landscapes. What is clear is that this one at Knockeennagroagh has been in the landscape long enough to become simply part of it, folded into the practical logic of a field boundary at some point in the post-medieval period when farmers incorporated whatever was to hand into their enclosures. The stone did not move; the farm reorganised itself around it.