Exodus 27:3-5

And thou shalt make its pots to take away its ashes, and its shovels, and its basins, and its flesh-hooks, and its firepans: all the vessels thereof thou shalt make of brass. And thou shalt make for it a grating of network of brass: and upon the net shalt thou make four brazen rings in the four corners thereof. And thou shalt put it under the ledge round the altar beneath, that the net may reach halfway up the altar.