Used for flexible patch cord connection of fiber circuits, provides multi-mode, single-mode, FC, SC, LC, ST and MT-RJ connectors; The adaptor porcelain terminal surface includes PC/UPC/APC; Any length can be selected and the number of cores, length, physical structure, etc of patch cord and tail fiber can be independently selected by customers. All fiber bushings are made of high-quality porcelain so that fiber tail cable and patch cord of any configuration can make optical signal loss very small and thus guarantee very low insertion loss and return loss.