This fragmentary round tower survives as just four courses of carefully cut granite ashlar blocks, representing the base of what was once a complete medieval tower. The interior diameter of 2.8 meters indicates this was a substantial structure that would have originally risen to considerable height.

The use of granite ashlar, precisely cut and fitted stone blocks, demonstrates the high quality of construction typical of important ecclesiastical sites. These surviving courses provide valuable evidence of the skilled masonry techniques employed by medieval Irish builders, even though the vast majority of the original structure has been lost over the centuries.

The fragment’s designation as National Monument No. 003 reflects its archaeological importance despite its modest surviving remains. These foundation courses offer crucial insights into round tower construction methods and help archaeologists understand the original scale and character of the complete structure.

While little remains visible today, the precision of the surviving stonework suggests this was once an impressive tower that served the ecclesiastical community at Killeshin. The loss of the upper portions, whether through deliberate demolition, gradual decay, or stone robbing for other construction projects, represents the fate of many Irish round towers that survive today only as fragmentary remains.