SDI Member Security Metal Products is a member of the Steel Door Institute (SDI). A non-profit association, SDI has set the standard for performance, use, and maintenance of steel doors and frames since 1954. Quality is everything when it comes to steel doors and frames. They are one of the few components of buildings that people are constantly in contact with—and often provide the first impression of your building. The Steel Door Institute has developed a new industry certification called SDI Certified. Security Metal Products has earned this certification by undergoing an audit to confirm we meet rigorous manufacturing, performance and quality standards. By referencing Security Metal Products in a specification, design professionals can be assured their doors and frames will meet the highest standards in the industry. Many manufacturers claim to meet SDI standards. We became SDI Certified and proved it. Choose Security Metal Products for quality steel doors and frames.