Standing 1.25 metres tall and notably narrow at just 18 centimetres wide, it is carved with a grooved Latin cross whose arms splay outward at their tips. What draws the eye, though, is the base of that cross: rather than sitting on a simple horizontal bar or stem, it rises from two L-shaped legs that one early observer, Crawford, writing in 1913, described as resembling "a pair of bent legs". It is an oddly figurative touch on an otherwise austere piece of early medieval stonework.

The pillar is the southernmost of four cross-slabs grouped in the area of St Brecan's Grave at Eoghanacht. St Brecan was an early Irish monastic figure associated with Inis Mór, and his reputed grave became a focus for carved memorial stones, a practice common across early Christian Ireland where such slabs marked either burials or stations for prayer. The unusual bent-leg base on this pillar is not unique to it; a comparable feature appears on at least one other slab from the same general cluster, which suggests it may reflect a localised carving convention rather than individual improvisation. The splayed terminals of the cross arms, too, are a recognised feature of early medieval Irish stonework, lending the design a slightly decorative quality within what is otherwise a restrained tradition.