Exodus 38:3-7

3Then he made all the altar utensils of bronze—the ash buckets, shovels, basins, meat forks, and firepans.

4Next he made a bronze grating and installed it halfway down the side of the altar, under the ledge.

5He cast four rings and attached them to the corners of the bronze grating to hold the carrying poles.

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

7He inserted the poles through the rings on the sides of the altar. The altar was hollow and was made from planks.