Deuteronomy 3:11

Only Og remained of the remnant of giants Namely, in those parts; for there were other giants among the Philistines, and elsewhere. When the Ammonites drove out the Zamzummims, mentioned Deuteronomy 2:20, Og might escape, and so be said to be left of the remnant of the giants, and afterward, fleeing to the Amorites, perhaps was made their king, because of his gigantic stature. His bedstead was a bedstead of iron Bedsteads of iron, brass, and other metals, are not unusual in the warm countries, as a defence against vermin. In Rabbath Where it might now be, either because the Ammonites, in some former battle with Og, had taken it as a spoil; or because, after Og's death, the Ammonites desired to have this monument of his greatness, and the Israelites permitted them to carry it away to their chief city. Nine cubits

So his bed was four yards and a half long, and two yards broad.