This granite block, a heavy cylinder nearly seventy centimetres across and over half a metre tall, began its recorded life in Ballymaghroe Graveyard in County Wicklow before being moved, at some point before 1933, to the disused Roman Catholic church at Knockananna. It has been sitting there since, a piece of early ecclesiastical stonework quietly waiting in a building that has itself fallen out of use.

The font is carved from a single block of granite and retains a good deal of its original detail despite some damage to the upper edge. The basin cut into its top is roughly circular, around forty-eight centimetres in diameter and just over twenty centimetres deep, and it still has a working drain hole, less than four centimetres wide, that exits through the side of the stone. From that point, a shallow linear groove runs down the outer face, presumably to carry water away from the font's base. On the outer surface, two crosses are carved in low relief, meaning they project only slightly from the flat face of the stone rather than being incised into it, positioned directly opposite one another. One cross is largely intact, standing about forty-six centimetres tall; the other has lost its upper section where the stone is damaged, and survives to around thirty centimetres. Both are formed by a narrow raised band, a restrained style that gives the decoration a plainness that feels deliberate rather than unfinished. The source for the move is recorded by Corlett and Weaver in their 2002 survey of Wicklow's early ecclesiastical sites, which places the relocation firmly before 1933 but gives no earlier date for the font's original context or manufacture.