... bolts 3)large span 4)long service life price for structural steel fabricationProducts specification:1.Construction Area: 17000 M2 2. ... strength bolts, common bolts, shearing bolts, bracket bolts ,nuts,plates, washer etc.11. Transport and packing : with packing ,main ... frame):Main frame:Qingdao Baoduo Steel Structure Co., LTD. produce light and heavy steel structure buildings for 13 years in Qingdao ...