As the oldest hollow metal door fabricator in the United States, we use only premium components and we guarantee complete customer satisfaction. Mesker's no-compromise values, backed by T.M.Cobb distribution and exceptional customer service, have made us a distinguished national leader among architects and contractors. We engineer our hollow metal doors and hollow metal frames to be the most rugged and durable in the commercial construction industry, with best-in-class fit & finish. Because we frequently exceed Steel Door Institute and Architectural Design specifications for quality and ingenuity, you've come to the right place - Mesker Door, the inventor of hollow metal doors and the leader in hollow metal door innovation now distributed by T.M.COBB.