US Patent No: 10,060,143 B2AR4 - 3-5/8" Arch ReturnMODULAR - Lineal Ft. / BoxMODULAR RAKED - LF/Boxn/aCLOSURE - Lineal Ft. / Boxn/aUTILITY - Lineal Ft. / Boxn/aNORMAN - Lineal Ft. / Boxn/a