And thou shalt make staves for the altar, staves of shittim wood, and overlay them with brass.
Staves ... rings - those rings were placed at the side through which the poles were inserted on occasions of removal.
Related Commentaries of Exodus 27:6
Exodus 27:6-7
6 And thou shalt make staves for the altar, staves of shittim wood, and overlay them with brass.
7 And the staves shall be put into the rings, and the staves shall be upon the two sides of the altar, to bear it.