Exodus 27:3-7

You shall make pots for it to receive its ashes, and shovels and basins and forks and fire pans. You shall make all its utensils of bronze. You shall also make for it a grating, a network of bronze, and on the net you shall make four bronze rings at its four corners. And you shall set it under the ledge of the altar so that the net extends halfway down the altar. And you shall make poles for the altar, poles of acacia wood, and overlay them with bronze. And the poles shall be put through the rings, so that the poles are on the two sides of the altar when it is carried.