SOSS Invisible Hinges now can be installed easier and faster than ever before. Each router guide template is individually handcrafted for exactness. The template is held on the door and jamb with nails; guide pins locate the deep mortise. The edges of the template assure a perfect outline when used with SOSS RGB100 Template Guide and Lock Nut, or the the Porter-Cable Template Guide #42024 (Lock Face Routing) and #42237 (Lock Nut).