One of the 4 Fassaroe Crosses 

The Rathmichael Cross is one of 4 distinct-looking crosses that are collectively known as the Fassaroe Crosses. They are generally wheel-shaped with a depiction of the crucifixion scene and are often mistaken for each other. They are also similar to crosses found in Cornwall which may also suggest that they were all carved by the same stonemason. The other 3 in the group are the St Valery’s Fassaroe Cross in Bray from which the group gets its name, the Killegar Cross, and the granite cross in Blackrock village.

Thanks to Ireland Calling for informative video