Steel-stiffened core design with welded 20-gauge hat segment stiffeners provides energy and sturdiness These are created for installation as Component of the wall framing sequence and will be specified and equipped as knock-down (KD) for industry assembly prior to set up or welded for set up as an entire unit. http://www.servicezz.com/directory/listingdisplay.aspx?lid=17445#.Yb91rMnMLIU