- Custom Railing Systems: Interior or Exterior Horizontal, Vertical, Castings, and Special Picket Designs Available. Spiral Stairs Centerless Stairs Railing Systems Serving the Pacific Northwest for over 22 years, we are the unquestioned leader in our field. Here at Northwest Ornamental Iron, Inc. our commitment is to excellence in product, service and above all - customer satisfaction. We ...biznw.com/nwoi