Duvinage is a leading manufacturer of custom metal stairs since 1895. The company was founded by Pierre Duvinage, who patented the first spiral metal staircase in the United States. From spiral stairs to straight egress stairs to the most sophisticated circular stairs in the world, we fabricate stairs that are renowned for architectural integrity and superior engineering. Duvinage, complete with its Sharon Stairs division, is the only American company capable of engineering and fabricating every type of metal stair, providing a single point of contact for architects, general contractors, and miscellaneous metal subcontractors.  A Key Bridge Company Duvinage is a proud member of the Key Bridge family of companies. Key Bridge Partners is a private company consisting of world-class manufacturing and service companies. Key Bridge Partners is committed to preserving the legacy of great brands and building premier global businesses.