This pin would have kept the wheel attached to the axle of a wheeled vehicle.

For further discussion of its possible significance to prehistoric driving vehicles and horses in the Late Bronze Age, see the 2022 article by Brian G. Scott and Rena Maguire "A Late Bronze Age linch-pin provenanced to Dunmore East, Co. Galway." in bibliography. Date for this object has been reassigned from Iron Age to Late Bronze Age based on research by Scott and Maguire.