Exodus 27:4

27:4 You are to make a grating for it, a network of bronze, and you are to make on the network four bronze rings on its four corners.

Exodus 38:4

38:4 He made a grating for the altar, a network of bronze under its ledge, halfway up from the bottom.

Exodus 27:5

27:5 You are to put it under the ledge of the altar below, so that the network will come halfway up the altar.