Concealed Hinges Beautifully disguised. McKinney concealed hinges virtually disappear from view when an opening is closed, while providing aesthetic continuity when a door is open. McKinney Concealed Hinges - MK40A Series McKinney Concealed Hinges - MK80 Series McKinney Concealed Hinges - MK80SS Series McKinney Concealed Hinges - MK80A Series McKinney Concealed Hinges - MK100 Series