The 819M-SMA-1.0V2 Fiber Adaptor is a SMA fiber adapter that connects to a 1 inch port on a 819C or 819D Series integrating sphere, either PTFE (spectralon) or barium sulfate (spectraflect) based. It replaces 819M-SMA-1.0. Comes with a 1.5 mm Allen wrench and M3 set screws.