Exodus 38:4-8

And he made for the altar a grating of bronze netting beneath, under its ledge, reaching halfway up.

He also cast four rings on the four ends of the bronze grating as holders for the poles.

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

Then he inserted the poles into the rings on the sides of the altar, with which to carry it. He made it hollow with planks.

Moreover, he made the basin of bronze with its base of bronze, from the mirrors of the serving women who served at the doorway of the tent of meeting.