Exodus 38:3-7

3Then he made all the utensils for the altar—the pots and the shovels, the basins, the forks and the fire pans. He made all the utensils from bronze.

4He also made a bronze grating net for the altar, under the ledge around it, reaching halfway up.

5He cast four rings for the four ends of the bronze grating, to be holders for the poles.

6He made the poles of acacia wood, and overlaid them with bronze.

7Then he put the poles into the rings on the sides of the altar to carry it, and he made it hollow, out of boards.