Exodus 38:9 (KJV)

And he made for the altar a brasen grate of network under the compass thereof beneath unto the midst of it.

And he cast four rings for the four ends of the grate of brass, to be places for the staves.

And he made the staves of shittim wood, and overlaid them with brass.

And he put the staves into the rings on the sides of the altar, to bear it withal; he made the altar hollow with boards.

And he made the laver of brass, and the foot of it of brass, of the lookingglasses of the women assembling, which assembled at the door of the tabernacle of the congregation.

Their pillars were twenty, and their brasen sockets twenty; the hooks of the pillars and their fillets were of silver.

And for the north side the hangings were an hundred cubits, their pillars were twenty, and their sockets of brass twenty; the hooks of the pillars and their fillets of silver.

And for the west side were hangings of fifty cubits, their pillars ten, and their sockets ten; the hooks of the pillars and their fillets of silver.

And for the east side eastward fifty cubits.

The hangings of the one side of the gate were fifteen cubits; their pillars three, and their sockets three.