Exodus 27:3-5

You shall make its pails for removing its ashes, and its shovels and its basins and its forks and its firepans; you shall make all its utensils of bronze. You shall make for it a grating of network of bronze, and on the net you shall make four bronze rings at its four corners. You shall put it beneath, under the ledge of the altar, so that the net will reach halfway up the altar.