See Exodus 27:2. Though these horns, as they were for another use, so they seem to be here of another form, and for ornament more than for service.
Related Commentaries of Exodus 30:2
Exodus 30:2
2 A cubit shall be the length thereof, and a cubit the breadth thereof; foursquare shall it be: and two cubits shall be the height thereof: the horns thereof shall be of the same.