The No 3916 Soss hinge consists of scissor-like arms which extend when pivoted, allowing a door or panel to swing open as much as 180 degrees. The hinge is completely invisible when the door is closed. The hinge measures 4-5/8″ x 2-3/4″ for use with doors a minimum of 1-3/8″ thick. For doors a minimum of 1-3/4″ thick, order the No 3918, and for 2″ doors, the No 3920. Finish options are limited.