Albert Barnes Commentary 2 Chronicles 3:11-12

"And the wings of the cherubim were twenty cubits long: the wing of the one [cherub] was five cubits, reaching to the wall of the house; and the other wing was [likewise] five cubits, reaching to the wing of the other cherub. And the wing of the other cherub was five cubits, reaching to the wall of the house; and the other wing was five cubits [also], joining to the wing of the other cherub." — 2 Chronicles 3:11-12 (ASV)

The wings of the cherubim - Compare 1 Kings 6:24–27.