Piano hinges, also known as ‘continuous hinges’, represent one of the many types of hinges where 6, 7, and 8-foot lengths are not uncommon. One big difference between piano hinges and other hinge types is the fact that piano hinges will run the full length of the surface they serve – hence, the name ‘continuous’. Piano hinges are available in various thicknesses, pin diameters, widths, finishes, and customized designs. http://www.sihaimetal.com/piano-hinge/