 The Dome of the Chain has a diameter of , making it the third largest building on the Haram after the al-Aqsa Mosque and the Dome of the Rock.According to a number of early Arab historians, the Dome of the Chain was used as a model for the Dome of the Rock.Like the latter, the Dome of the Chain consists of two concentric polygons, with columns bound together by arcades and wooden beams.