0.25+/-0.05 meter long, 3mm OD PVC jacketed, 50/125µm graded index multimode fiber for infrared and visible wavelengths, terminated with a Super PC polished FC connector on one side and an 8 degrees angle polished 2.5mm OD ST PLUG ferrule on the other side. SP: The 8 degrees angle polish orientation with respect to the ST plug key is random. The ST plug ferrule endface is 8 degrees curved polished (not flat), just like endface finishes on APC polished connectors.