Exodus 38:5

3 And he made all the utensils of the altar, the pots, the shovels, the basins, the forks, and the fire pans. He made all its utensils of bronze.

4 And he made for the altar a grating, a network of bronze, under its ledge, extending halfway down.

5 He cast four rings on the four corners of the bronze grating as holders for the poles.

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

7 And he put the poles through the rings on the sides of the altar to carry it with them. He made it hollow, with boards.