The earthwork is not immediately dramatic. Its bank has been worn down and partially absorbed into a townland boundary, so the enclosure reads more as a gentle undulation in the grassland than a deliberate fortification. Yet its proportions, roughly 25 metres across, and the surviving stretch of external fosse, the ditch that would once have reinforced the bank, are enough to identify it as a ringfort, the most common monument type in the Irish countryside.

Ringforts were enclosed farmsteads, built predominantly between the sixth and tenth centuries, where a farming family would have lived, kept livestock, and worked the surrounding land. Thousands survive across Ireland in varying states of preservation, from well-defined earthen raths to the kind of fragmentary outline seen at Knockbrack. Here, the bank remains legible from the east-north-east around through the south and on to the west-north-west, while the fosse holds its form from the south-south-west to the west. Two small quarries lie immediately outside the bank on the eastern and southern sides, suggesting that at some point stone or earth was extracted close to the monument, possibly contributing to the erosion of those sections. Whether the quarrying is ancient or relatively recent, the notes do not say, but their position just outside the enclosure gives the site a slightly irregular outline that rewards a closer look across the grass.