Founded in 1977. Deltana is an architectural hardware manufacturer with a proven record for exceptional service and quality. Deltana inventories America's largest selection of architectural and door hardware in over nine fine finishes made from solid brass, zinc, aluminum, steel, and stainless steel. The Deltana extension flush bolt is designed with a unique cam mechanism that allows a smooth open-close sliding action. It eliminates springs that can break. The extension rod is made of stainless steel.