One, to the south of a low central mound, was reportedly around thirty feet deep before the landowner had it closed up. A second lay to the north and has also been filled in. Whatever their original purpose, neither shaft is now accessible, and no explanation for them survives in the record. That absence of explanation is, in its own way, the most interesting thing about the place.

The earthwork itself is a rath, the term used for a roughly circular enclosure, typically of early medieval date in Ireland, formed by one or more banks with an accompanying ditch or fosse. This one, at Tubrid Beg, was originally bivallate, meaning it had two concentric rings of bank and ditch. The outer ring has been entirely removed, with no visible trace remaining, leaving only the inner enclosure. At the centre of that enclosure sits a circular mound, measuring approximately 7.2 metres north to south and 7.8 metres east to west, and rising to about 1.2 metres in height. The depression marking the southern shaft lies roughly 6.8 metres from the mound's edge. These details come from Caroline Toal's North Kerry Archaeological Survey, published in 1995, which drew on fieldwork and conversation with the landowner at the time. The shafts are not a common feature of rath interiors, and the notes offer no interpretation of what they were for, whether practical, ritual, or something else entirely.