It is over two metres long, tapered from head to foot, and carved with an incised ringed cross sitting on a pyramidal base. The detail is precise enough to reward close attention: three of the slab's edges carry a narrow chamfer, a shallow angled cut that lifts the stonework slightly from the purely functional, though the chamfer on the top and base edges stops short of the left-hand side, an asymmetry that is easy to miss but quietly deliberate.