Exodus 35:16

35:16 the altar for the burnt offering with its bronze grating that is on it, its poles, and all its utensils; the large basin and its pedestal;

Exodus 38:4-5

38:4 He made a grating for the altar, a network of bronze under its ledge, halfway up from the bottom. 38:5 He cast four rings for the four corners of the bronze grating, to provide places for the poles.