China Bulb Flat Manufacturer | HYVER STEEL CO,.LTD If you are looking for a manufacturer of china bulb flats. So you've arrived at the right place. To stiffen the construction, plates are horizontally welded to bulb flats on the interior side of the body. Contact us at +8652788858893 or visit our website for more information. Visit us: http://en.hyversteel.com/prod_view.aspx?nid=3&typeid=68&id=172