The Making of The Altar of Whole Burnt Offering (Exodus 38:1-7).
‘And he made the altar of whole burnt offering of acacia wood: five cubits was its length, and five cubits was its breadth, it was foursquare; and three cubits was its height. And he made its horns on the four corners of it; its horns were of one piece with it: and he overlaid it with bronze. And he made all the utensils of the altar, the pots, and the shovels, and the basins, the flesh-hooks, and the firepans: all its utensils he made of bronze. And he made for the altar a grating of network of bronze, under the ledge round it beneath, reaching halfway up. And he cast four rings for the four ends of the grating of bronze, to be places for the staves. And he made the staves of acacia wood, and overlaid them with bronze. And he put the staves into the rings on the sides of the altar, with which to bear it; he made it hollow with boards.'
For details of the Altar of Burnt Offering see on Exodus 27:1-8.