Completely concealed hinges allow for flush exterior surface design, more security and better aesthetics. Metal hinges deliver strength and durability for heavier cabinet door applications. Engineered plastic quick-release hinge provides a lightweight, non-conductive, non-corrosive option with dual hinge points for greater stability. Removable pin designs provide a more economical option for tool-free door removal. Spring-loaded retractable pin designs lock into retracted position for easier door installation/removal, lock into engaged position for secure operation. Industry applications: computers; construction equipment, off-highway vehicles, farm equipment; electronic Enclosures; exhibits/signs; food equipment; furniture; HVAC; industrial Enclosures; industrial machines, machine tools and metal cutting; marine; medical; networking; railway; telecommunications; vending machines.