Profile: S & D Products, Inc. is a manufacturer of all types of hinges. We also offer laser cutting and metal stamping services. We provide various types of hinges that include bi-fold, butt, case, concealed, continuous, custom, gate, heavy duty, knife, latch, overlay and slip joint hinges. Continuous hinges are also known as piano hinges. They can be used in any setting requiring a hinge of specific length. We manufacture continuous hinges in a wide variety of lengths and finishes. Continuous hinges are used in fixtures and in industrial settings.