A Soss hinge is considered an invisible hinges because it cannot be seen when the door is closed. In this video you will see how to route for a Soss hinge using a Porter Cable router. Not many contractors know how to install a Soss hinge, but with proper training on how to install a Soss hinge, it can create that special detail that will stand out aesthetically for any home. Need a new door with invisible hinges? We can help!