Exodus 38:1-5

Then he made the altar of burnt offering of acacia wood, five cubits long, and five cubits wide, square, and three cubits high.

And he made its horns on its four corners, its horns being of one piece with it, and he overlaid it with bronze.

He also made all the utensils of the altar, the pails, the shovels, the basins, the meat-forks, and the firepans; he made all its utensils of bronze.

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.