A network of brass for the bottom of the great altar of sacrifice (Ex. 27:4; 35:16; 38:4, 5, 30).
Grate
The altar of burnt offering had a grate, and the instructions for it are specific. God tells Moses to make “a grate of network of brass” with four brass rings at the corners, and to set it under the altar’s rim, halfway down. Exodus 38 then reports that Bezalel’s craftsmen made it, casting the rings to hold the poles used to carry the altar. These verses are about carrying as much as burning, because the tabernacle was meant to travel with the people. The grate is a small detail, and Scripture takes the trouble to record it. See Exodus 27:1-8 for the whole altar.
4 verses
Exodus
Exodus 27:4
And thou shalt make for it a grate of network of brass; and upon the net shalt thou make four brasen rings in the four corners thereof.
Exodus 27:5
And thou shalt put it under the compass of the altar beneath, that the net may be even to the midst of the altar.
Exodus 38:4
And he made for the altar a brasen grate of network under the compass thereof beneath unto the midst of it.
Exodus 38:5
And he cast four rings for the four ends of the grate of brass, to be places for the staves.
From Easton's Bible Dictionary
Matthew George Easton, 1897