... . The highly advantage of rolled steel is its large span. Featutre of Hwarrior Steel Frame door:1. Excellent appearance with smooth ... 3. Good performance in air tightness, water proof and safety, effectively insulating sound and heat;4. Durable, stronger, (fireproof, antiseptic, ... avaliable, such as tempered, tinted,low-e, laminated and etc;8. Good convenience to install and clean. Steel Frame door