... 3,Long service life two-storey steel structure house NameQingdao Yili Steel Structure & Engineering Co.,Ltd. ... gymnasium, poultry shed ,garden shed ,guard room ,police kiosks ,kiosks ,stairs ,bridge, exhibition hall, prefab house ,storage ,garage ,oil station , ... other steel parts etc . Main productsSteel structure building ,prefab house ,steel grating ,galvanized steel parts etc .Quality standard * ...